Things we don not know for sure – how it’s happening, how was created, how it is. Questions that people do not know the answer!

Panther from Florida

Panthers from Florida and conservation

The panthers from Florida once roamed the southeastern United States. Now, the few panthers left in the wild are confined to remote cypress swamps in southwestern Florida. The panthers are the most endangered species of mammal in the U.S. It's…
Predicting El Nino 3

How do herds form?

Nature enthusiasts are fascinated by herds of animals like elephants and elk But you'll probably never see a herd of cats. Why some animals gather together as herds? Many animals display herding -- or group-forming -- behavior . There are…
Predicting El Nino 3

Why do octopuses have three hearts?

Are three hearts better than one? And is it possible to sleep underwater? The answer to both questions is yes -- if you're an octopus. Octopuses need all three hearts to circulate blood through their bodies. Two of the hearts are called branchial…
Predicting El Nino 1

The survival tactics of horned lizards

In the mid-16th century, when Spain sent its first scientific explorers to Mexico, Francisco Hernandez reported seeing a lizard squirt blood from its eyes. Horned lizards -- found primarily in Mexico and the American Southwest. Imagine a…
Predicting El Nino 3

Ocean Guilds

The great white shark and the Salmon shark are closely related -- each part of what's called a shark "guild." Up next -- a scientist talks about tracking the movements of shark guilds. Speaking with Randy Kochevar, a scientist with California's…
Predicting El Nino 3

Ancient Microbes

For decades, scientists assumed that Antarctica's Lake Vida was entirely frozen -- and devoid of life. But Peter Doran suspected there might be liquid water -- and even life -- at the bottom of the lake. Peter Doran is an Earth scientist…
Bioenergy and Photosynthesis-Drawing by Michael Hagelberg

Carbon Below

Carbon dioxide, or CO2, makes up a tiny fraction of Earth's atmosphere, and yet CO2 can have a big effect on long-term warming of our planet. A scientist talks about how Earth deals with CO2. And in the U.S., even though we have approximately…
Predicting El Nino 3

The biggest meteor known to collide with Earth?

What's the biggest meteor that we know of that hit the Earth? And when and where did it hit the Earth? Computer models suggest that, early in Earth's history, a piece of debris not much less massive than Earth might have slammed into us and…
Predicting El Nino 2

What causes a superior mirage?

A question from a visitor. He writes, "Last summer while in my sailboat in southeast Alaska I could see what appeared to be icebergs floating in the sky. They appeared about 15 miles away. Icebergs were present, and the weather was calm, clear…
Predicting El Nino 3

Bioreactors - bacteria are encouraged to flourish

Every year, Americans generate some 220 tons of waste that's a little over four pounds of curbside garbage per person, per day. And much of this waste ends up in landfills, where there's not enough air, water, sunlight and bacteria to let…
Predicting El Nino 3

Alaska Glaciers

"Are the glaciers we see here in Alaska remnants of the last ice age -- or newer, more recent formations?" The geologists we talked with said that some Alaskan glaciers are very dynamic. For example, the glaciers of southeastern Alaska receive…
Predicting El Nino 3

Predicting El Nino

El Nino is a warming in the Pacific Ocean that can affect weather half a world away. So far, predicting El Ninos has meant looking for subtle changes in sea surface temperatures and wind currents. But these changes signal that an El Nino…