When Hahna Alexander set out to create a shoe that could charge a battery, she had no idea what challenges lay ahead of her.
The inventing part went smoothly enough. Like many first-time inventors, she had a good idea and a passion for her work. She successfully invented a shoe that harnesses energy from each step the wearer takes. That energy can be used to charge a battery.
What do elephant seals and Shakira have in common? They can both keep the beat.
A new study suggests that northern elephant seals memorize the rhythm and pitch of individual vocal calls in order to recognize each other. Knowing who's who is important because elephant seals live in social colonies run by dominant males. Submissive males need to be able to recognize when the alpha male is around in order to avoid getting the blubber kicked out of them.
In Suitland, Maryland a giant warehouse holds the largest collection of whale bones in the world.
Stacked from floor to ceiling are bones of sperm whales, gray whales, and the largest whales on Earth—blue whales, which can reach 380,000 pounds. Ancient whale fossils, tens of millions of years old, are also packed into the collection.