What is the difference between softwood and hardwood trees?
on October 26th, 2006 | 3 answers | 1 person likes this

What does the abbreviated book title "Consid. Gen. Anim. Crust. Arach. Ins." mean?
on August 18th, 2006 | One answer

My boyfriend gets a rash from his own semen. What could cause this?
on May 12th, 2006 | One answer

I've recently started seeing a guy who is struggling to make ends meet but always insists on paying whenever we go out. How can I...
on April 27th, 2006 | 6 answers | 5 people like this

Can eating too many persimmons make a person ill?
on March 25th, 2006 | One answer

What is autoinhibition?
on March 25th, 2006 | 2 answers | 1 person likes this

Are alcohol thermometers, mercury thermometers, and digital thermometers equally accurate?
on March 25th, 2006 | One answer

How do you clean up a broken mercury thermometer?
on March 25th, 2006 | 9 answers

What does it feel like when you meet your soul mate for the first time?
on March 21st, 2006 | 76 answers | 21 people like this

What is the slowest-growing bacterium?
on March 20th, 2006 | One answer

Who is the "Phantom Orange Shirt Guy"?
on February 25th, 2006 | 3 answers

What are Koch's postulates?
on February 23rd, 2006 | One answer

How does liquid nitrogen cause materials to become brittle and shatter?
on February 17th, 2006 | 3 answers | 1 person likes this

Is it possible for eyes to get frostbitten?
on February 17th, 2006 | One answer

What did Sartre mean by, "Hell is other people"?
on February 17th, 2006 | 18 answers | 7 people like this

How can I keep my cool when dealing with a rude coworker?
on February 16th, 2006 | 6 answers | 2 people like this

How do you bone a chicken?
on February 14th, 2006 | 6 answers | 3 people like this

What sort of bacteria are found in yogurt?
on February 12th, 2006 | One answer | 1 person likes this

How big is a normal adult eyeball?
on February 11th, 2006 | One answer

How big is the blind spot of a normal eye?
on February 11th, 2006 | One answer

Which show was on longer: "Beakman's World" or "Bill Nye the Science Guy"?
on February 11th, 2006 | One answer

What do "zinc fingers" do?
on February 10th, 2006 | One answer

What are prions?
on February 10th, 2006 | 2 answers

What are viroids?
on February 10th, 2006 | One answer

How do viruses replicate?
on February 10th, 2006 | One answer

Are viruses alive?
on February 10th, 2006 | One answer

Why do some people pluralize the word virus as "virii"?
on February 10th, 2006 | 2 answers

What do fungi eat?
on February 10th, 2006 | 5 answers

Is it a fashion faux pas to wear black and brown together?
on February 9th, 2006 | 2 answers

What mechanisms are responsible for the reproductive isolation of organisms in a population?
on February 6th, 2006 | One answer

What is a niche?
on February 6th, 2006 | One answer

What is a metapopulation?
on February 6th, 2006 | One answer

What is a Lotka-Volterra equation?
on February 6th, 2006 | One answer | 1 person likes this

What is a carrying capacity?
on February 6th, 2006 | One answer

What is a protocooperation?
on February 6th, 2006 | One answer | 1 person likes this

What is a mutualism?
on February 6th, 2006 | One answer | 1 person likes this

What is competition?
on February 6th, 2006 | 2 answers | 1 person likes this

What is an amensalism?
on February 6th, 2006 | One answer | 1 person likes this

What is a commensalism?
on February 6th, 2006 | 2 answers | 1 person likes this

What is a neutralism?
on February 6th, 2006 | One answer | 1 person likes this

What are "boom and bust" cycles?
on February 6th, 2006 | 2 answers

What prevents biological populations from getting too large?
on February 6th, 2006 | 2 answers

What is a survivorship curve?
on February 6th, 2006 | One answer

In a single-species population, how are the birth rate and death rate determined?
on February 6th, 2006 | One answer

What is the correct pronunciation of "Himalayas"?
on February 6th, 2006 | 3 answers | 1 person likes this

What is the proper U.S. pronunciation for words like "succinct", "flaccid", and "accept"?
on February 6th, 2006 | 5 answers

How do you get the smell of smoke out of a plastic DVD case?
on February 5th, 2006 | One answer

What is a dehiscence?
on February 5th, 2006 | One answer

What is an abscission?
on February 5th, 2006 | One answer

What is a dicot?
on February 5th, 2006 | One answer

What is a monocot?
on February 5th, 2006 | 3 answers

What is a cotyledon?
on February 5th, 2006 | One answer

What causes muscles to twitch?
on February 5th, 2006 | One answer

Why do plants make caffeine?
on February 5th, 2006 | One answer | 1 person likes this

Why do people in certain countries pronounce the word lieutenant as "lef-tenant"?
on February 4th, 2006 | One answer | 1 person likes this

What is the origin of the phrase, "you're full of beans"?
on February 4th, 2006 | One answer

Where did the term "polka dot" come from?
on February 4th, 2006 | One answer | 1 person likes this

How do those t-shirts that change color in sunlight work?
on February 4th, 2006 | One answer

What is a sunspot?
on February 3rd, 2006 | 5 answers | 2 people like this

What is the highest temperature ever produced in a laboratory?
on February 3rd, 2006 | 3 answers

How do insects survive in winter?
on February 3rd, 2006 | 2 answers

What is the air speed velocity of an unladen swallow?
on January 31st, 2006 | 43 answers | 7 people like this

What is a biome?
on January 31st, 2006 | 2 answers

What is the highest temperature at which a housefly can survive?
on January 31st, 2006 | One answer

What is cytoplasmic streaming?
on January 29th, 2006 | One answer

What causes the cat's-eye effect in a gemstone?
on January 29th, 2006 | One answer | 1 person likes this

Why does alexandrite appear to change color in sunlight and artificial light?
on January 29th, 2006 | One answer | 2 people like this

What causes the characteristic appearance of star sapphires, rubies, and other gemstones?
on January 29th, 2006 | 3 answers | 1 person likes this

Is it true that rubies and sapphires are just variants of the same mineral?
on January 29th, 2006 | 3 answers | 5 people like this

How often do dental amalgam fillings need to be replaced?
on January 29th, 2006 | One answer

How can I overcome a fear of going to the dentist?
on January 29th, 2006 | 11 answers | 1 person likes this

Is it really necessary to brush twice daily?
on January 29th, 2006 | 2 answers | 1 person likes this

What is "air layering"?
on January 28th, 2006 | One answer

Are all solanaceous plants toxic?
on January 28th, 2006 | One answer

Why do people get rashes from coming in contact with poison ivy?
on January 28th, 2006 | One answer

Are bitter almonds poisonous?
on January 28th, 2006 | One answer

What drugs and medicines were originally derived from plants?
on January 28th, 2006 | 8 answers | 4 people like this

How do plants guard against herbivory?
on January 28th, 2006 | One answer

What is allelopathy?
on January 28th, 2006 | One answer

What are mycorrhizae?
on January 28th, 2006 | One answer

Why does the grass on a lawn grow back in spite of all the mowing we do?
on January 26th, 2006 | 5 answers | 3 people like this

What are primary and secondary succession?
on January 26th, 2006 | 3 answers

What determines the maximum height to which vegetation can grow?
on January 26th, 2006 | 2 answers

What is primary productivity?
on January 26th, 2006 | One answer

What is an ecosystem?
on January 26th, 2006 | One answer

Who coined the term "ecology"?
on January 26th, 2006 | One answer

What is an ecological niche?
on January 26th, 2006 | One answer

What is the difference between interspecific and intraspecific competition?
on January 26th, 2006 | 2 answers

What is the Lotka-Volterra model of predator-prey interactions?
on January 26th, 2006 | One answer

What is a metapopulation?
on January 26th, 2006 | One answer

Are there any equations that model the spread of invasive species? What are they?
on January 26th, 2006 | 2 answers

What is integrated pest management?
on January 26th, 2006 | 2 answers

What characterizes a "successful" invasion of a species?
on January 26th, 2006 | One answer

Are ectopic pregnancies more common in women who have endometriosis?
on January 23rd, 2006 | One answer

How do conjoined twins form?
on January 21st, 2006 | 2 answers

How much is a "grain of morphine"?
on January 16th, 2006 | One answer | 1 person likes this

Do plants get cancer?
on January 16th, 2006 | 6 answers | 1 person likes this

What would happen to plants if all the animals in the world suddenly died out?
on January 16th, 2006 | 3 answers | 1 person likes this

What is an ombrotrophic bog?
on January 16th, 2006 | One answer

There's an early 1990s Budweiser commercial where a man on a beach sees a giant floating head that says, "Relax, listen to the...
on January 16th, 2006 | 3 answers

Can blind people tell the difference between night and day?
on January 9th, 2006 | 7 answers | 1 person likes this

What is a coleoptile?
on January 8th, 2006 | One answer

What is the difference between Photosystem I and Photosystem II?
on January 8th, 2006 | One answer

What is ethnobotany?
on January 8th, 2006 | One answer

When was the first ecology textbook written?
on January 7th, 2006 | One answer

What is landscape ecology?
on January 7th, 2006 | One answer

How do invasive species spread?
on January 7th, 2006 | 2 answers

What is classical biological control?
on January 7th, 2006 | One answer

What makes a species invasive?
on January 7th, 2006 | One answer

What does ecology mean?
on January 6th, 2006 | 9 answers | 1 person likes this

How do I get a vomit stain out of a carpet?
on January 6th, 2006 | One answer

How do plants produce oxygen?
on January 5th, 2006 | 9 answers | 2 people like this

What is the oldest living organism?
on January 4th, 2006 | One answer

What is a "super-taster"?
on January 4th, 2006 | One answer

What plant families have stems that are square in cross section?
on January 4th, 2006 | One answer

Is this program medically accurate?
on January 3rd, 2006 | 5 answers | 2 people like this

Can a person function normally with only half a brain?
on January 3rd, 2006 | 4 answers

What is pleochroism?
on January 3rd, 2006 | One answer

Why do some minerals fluoresce in short-wave but not long-wave UV light?
on January 3rd, 2006 | 2 answers

How does "watermelon tourmaline" form?
on January 3rd, 2006 | One answer

Did Noah have any plants on his ark?
on January 3rd, 2006 | 3 answers | 1 person likes this

What is a strangelet?
on January 3rd, 2006 | One answer

How does a polarizing microscope work?
on January 2nd, 2006 | 3 answers | 2 people like this

What is optical calcite?
on January 2nd, 2006 | One answer

How do geodes form?
on January 2nd, 2006 | 2 answers

Do earwigs really crawl inside people's ears?
on December 10th, 2005 | 5 answers | 1 person likes this

How can I tell how many puffs are left in my albuterol inhaler?
on November 28th, 2005 | 2 answers

What is the difference between sedges, rushes, and grasses?
on November 13th, 2005 | 2 answers

How does the "sensitive plant" respond to mechanical stimuli?
on November 13th, 2005 | 2 answers | 1 person likes this

What does alternation of generations mean?
on November 11th, 2005 | One answer

What is a zygomycete?
on November 11th, 2005 | One answer

What is a deuteromycete?
on November 11th, 2005 | One answer

What is an ascomycete?
on November 11th, 2005 | One answer

What is a basidiomycete?
on November 11th, 2005 | One answer

What is a hypha?
on November 11th, 2005 | One answer

What is a coenocytic?
on November 11th, 2005 | 2 answers

What is a gametophyte?
on November 11th, 2005 | One answer

What is a sporophyte?
on November 11th, 2005 | One answer

What are Zeno's Paradoxes?
on November 6th, 2005 | 2 answers

What is blood plasma?
on November 6th, 2005 | One answer

How can a woman donate eggs?
on November 5th, 2005 | One answer

My boyfriend recently left because of a family crisis. Now he won't return my calls, e-mails, or IMs, but still spends hours on...
on November 5th, 2005 | 7 answers | 5 people like this

How does the human body metabolize alcohol?
on November 5th, 2005 | 2 answers

What is a slime mold?
on November 5th, 2005 | 2 answers

Are there any fungi that can eat animals?
on November 5th, 2005 | One answer

What is the body of a fungus made of?
on November 5th, 2005 | One answer

What is ergot and why is it important?
on October 28th, 2005 | One answer | 1 person likes this

What are "imperfect" fungi?
on October 28th, 2005 | One answer

What is a "vug"?
on October 28th, 2005 | One answer

Is it normal to feel jealous about the number of partners my significant other has had in the past?
on October 24th, 2005 | no answers

Why does Dr. House walk with a limp?
on October 22nd, 2005 | 6 answers | 1 person likes this

What is a "hopper crystal"?
on October 7th, 2005 | One answer

Is pyrite the only mineral that crystallizes in pyritohedrons?
on October 7th, 2005 | One answer

How do boreal forests differ from temperate forests?
on October 5th, 2005 | 3 answers | 1 person likes this

How do you tell the difference between a quaking aspen and a paper birch?
on October 5th, 2005 | One answer

What species of tree can be found in a Northern Boreal Forest?
on October 5th, 2005 | 2 answers

How do an insect's senses differ from those of a human?
on October 4th, 2005 | One answer

How do hissing cockroaches hiss?
on October 4th, 2005 | 3 answers | 1 person likes this

What is hemolymph?
on October 4th, 2005 | One answer

What kind of muscles do insects have?
on October 4th, 2005 | One answer

How do the mouthparts differ among grasshoppers, butterflies, flies, and true bugs?
on October 4th, 2005 | One answer

How do taste buds work?
on October 2nd, 2005 | 3 answers

What measurements can be taken with a Biltmore stick?
on October 2nd, 2005 | One answer

How is an increment borer used?
on October 2nd, 2005 | One answer

How does a forester's prism work?
on October 2nd, 2005 | One answer

What techniques can be used to measure the height of trees?
on October 2nd, 2005 | no answers

How do you measure the height of a tree?
on October 2nd, 2005 | 3 answers

How did the osage-orange acquire the name "bois d'arc"?
on October 2nd, 2005 | One answer

How do spiders breathe?
on October 1st, 2005 | One answer | 1 person likes this

What fungus shoots its own spores?
on September 25th, 2005 | One answer

What is the difference between C3, C4, and CAM photosynthesis?
on September 25th, 2005 | 5 answers

Is it possible for a rapidly plunging crustal slab to affect the motion of the inner core?
on May 10th, 2005 | One answer

Is the inner core perfectly spherical? How do we know?
on May 8th, 2005 | One answer

How long does it take for lava to cool enough for it to be walked upon?
on May 8th, 2005 | 7 answers | 2 people like this

What are the first plants to inhabit a cooled volcanic flow?
on May 8th, 2005 | One answer

What are Ekman spirals? How do they relate to Langmuir cells?
on May 6th, 2005 | One answer

What are Skolithos burrows and how do they pertain to biostratigraphy?
on May 6th, 2005 | One answer | 3 people like this

Where on Earth can the entire geological column be observed?
on May 6th, 2005 | One answer

Why does Pepsi fizz when you add Equal to it?
on May 6th, 2005 | One answer

Is there any difference between bonsai trees and their normal-sized counterparts?
on May 6th, 2005 | 5 answers | 1 person likes this

What is the earliest fossil record of a plant?
on May 6th, 2005 | 2 answers

When did the first angiosperms evolve?
on May 6th, 2005 | One answer

When a vegetarian decides to reintroduce meat into his diet, people often say to "start slow because you've killed off your...
on May 5th, 2005 | 3 answers | 2 people like this

What is the Gunn-Peterson effect?
on May 4th, 2005 | 3 answers

Is it harmful to get flour in the eye?
on April 30th, 2005 | 7 answers

What are "bryophytes" and why are they important?
on April 29th, 2005 | One answer

How does the United States government decide which plants qualify as "noxious weeds"?
on April 28th, 2005 | One answer

What are "secondary compounds"?
on April 25th, 2005 | One answer

What common household products can be dangerous to cats?
on April 25th, 2005 | 6 answers

Are there any foods that should be avoided during pregnancy? What are they?
on April 24th, 2005 | One answer | 1 person likes this

Why are pregnant women advised not to handle broken tablets of Propecia?
on April 24th, 2005 | One answer

Is there a disorder in which substances like caffeine have no effect?
on April 22nd, 2005 | 2 answers

What is the heaviest (most dense) wood on earth?
on April 22nd, 2005 | 2 answers

How does caffeine work?
on April 22nd, 2005 | One answer

Why does the iris change color in adult accipiters?
on April 21st, 2005 | One answer | 2 people like this

How are "extra-crispy" tater tots made?
on April 21st, 2005 | 2 answers

Why doesn't paper money disintegrate when it's been through the laundry?
on April 21st, 2005 | One answer

How was papyrus made?
on April 21st, 2005 | One answer

What is the lightest wood?
on April 21st, 2005 | 2 answers

How do chytrid spores differ from those of other fungi?
on April 21st, 2005 | One answer

How do fungi reproduce?
on April 21st, 2005 | 4 answers | 1 person likes this

What is so special about plants in the family Araucariaceae?
on April 21st, 2005 | One answer

How can I construct a homemade plant press?
on April 21st, 2005 | 2 answers

What are "soap lilies"?
on April 21st, 2005 | One answer

What are saponins? What are they used for?
on April 21st, 2005 | One answer

What are the most important glycosides involved in plant poisonings?
on April 21st, 2005 | One answer

Why is straight, blonde hair preferable to other types in the construction of a hair hygrometer?
on April 19th, 2005 | One answer

What is synesthesia?
on April 19th, 2005 | 2 answers | 1 person likes this

What is the term for the spikes at the end of a stegosaur's tail?
on April 19th, 2005 | One answer

What are autism and Asperger's syndrome? What are their symptoms?
on April 19th, 2005 | 9 answers | 3 people like this

Why do people who have had a limb amputated still "sense" its presence?
on April 19th, 2005 | 4 answers | 3 people like this

What is proprioception and why is it important?
on April 19th, 2005 | One answer

What is "quintessence"?
on April 17th, 2005 | One answer

How do rods and cones work?
on April 17th, 2005 | One answer | 1 person likes this

Why is the odor of refrigerated celery so pervasive?
on April 16th, 2005 | 2 answers | 1 person likes this

What is a sporophyte?
on April 14th, 2005 | One answer

What is a gametophyte?
on April 14th, 2005 | One answer

What is a gynoecium?
on April 14th, 2005 | One answer

What is an androecium?
on April 14th, 2005 | One answer

What is a corolla?
on April 14th, 2005 | One answer

What is a calyx?
on April 14th, 2005 | 2 answers

What is a meristem?
on April 14th, 2005 | One answer

How many city blocks are in one mile?
on April 12th, 2005 | 2 answers | 1 person likes this

What is the meaning of the song "Maxwell's Silver Hammer"?
on April 4th, 2005 | One answer

What is a phloem?
on March 30th, 2005 | One answer

What is a xylem?
on March 29th, 2005 | One answer