Piezoelectric materials produce an electric voltage when they are bent or squished. This can let us harvest electricity from movement.
This is someone’s weight in kilograms divided by the square of their height in meters. But it’s not a measure of someone’s health.
A molecule is a group of atoms linked with chemical bonds. It’s the smallest particle of a substance that has all of its chemical properties.
Breathe in and out, that’s respiration. Have a cell break down sugars for energy, and that’s respiration too.
Algebra is a type of mathematics that studies symbols and how they can be shifted around.
Some insects land on the eyeballs of larger animals. They are seeking out the salt and proteins in the animal’s tears.
Medullary bone is a layer that forms inside bird and dinosaur bones. It’s a source of the calcium in eggshells.
Velocity is more than speed. It is both speed and the direction in which an object is traveling.
When it’s time for cells to die, they need to do it carefully, so they don’t harm other cells.
Puberty is a time when hormones surge and people develop the ability to have children. But it’s so much more than that.
Evolution is how species change over time. Individuals in the group vary, and some will pass on their genes. Over time, the whole species changes.
Nucleus comes from the Latin term “nuc,” meaning nut or kernel. In science there are lots of nuclei. Every one of them is the center of something.