-
Why aren't mammals as colorful as reptiles, birds or fish?Many mammals have fur the color of brown and black. Why don't they have more exotic colors, like purple and neon pink?
4 Comments -
Did any cat breeds develop naturally?Humans have undoubtedly bred cats to create certain breeds, but did any of these feline breeds emerge naturally?
3 Comments -
Do any infectious diseases have a 100% fatality rate?Researchers have made great strides to prevent deaths from fatal diseases, but the cures for some of them still elude us.
-
Will Mount Everest always be the world's tallest mountain?The Himalayas' massive heights result from a unique combination of geologic factors.
-
Which animal can have the most babies at one time?How many offspring an animal can have depends on many factors, such as whether they're aquatic and how they get around.
-
What was the first animal on Earth?Using fossil evidence and genetic dating, geneticists and paleontologists have backed strikingly different candidates for the world's first animal.
-
Why do only some animals have periods?Humans are not the only organisms that have periods — some animals do too, but scientists still aren't sure why.
-
Will we have more earthquakes because of climate change?Changes in sea level and glacial melt could make earthquakes more likely in the coming years.
-
Which continent has the most animal species?The diversity of even the largest animals depends on the smallest factors.
-
Why did Homo sapiens emerge in Africa?Our human ancestors arose in Africa due to many factors, including climate.
-
Why do most mammals have 5 fingers?The simple question of "why five" has puzzled scientists from multiple fields, and the answer still isn't entirely clear.
-
How much does Earth weigh?Earth's mass took hundreds of years to estimate, and even now, experts don't agree on the exact number.
