We walk here, we walk there, we walk everywhere. Maybe you’re headed to work or to lunch in a busy city. You’re expending energy, and the exercise is good for you. But what if, on top of that, we could recapture all that freely supplied…
Trapped in the enamel of fossilized dinosaur teeth is a fascinating glimpse into the Earth’s atmospheric past stretching back 150 million years. A recent study shows that carbon dioxide levels back then were far higher than today, thanks to the…





