How Do Our Bodies Move?

How is it that we’re able to move so freely and effortlessly without a conscious, concentrated effort? Your brain works in conjunction with your muscles, which in turn work with your skeletal bones to produce a wide variety of movements. The brain sends signals via the nervous system, including the spinal cord and nerves, to the muscles. The muscles then contract to create movement. Your…

Why do we need sleep?

Every creature needs to rest. Giraffes, little babies, elephants, dogs, cats, kids, koala bears, grandparents, moms, dads, and hippos in the jungle — they all sleep! Just like eating, sleep is necessary for survival. Researchers have also shown that after people sleep, they tend to retain information and perform better on memory tasks. Our bodies all require…

Why does your hair turn grey?

As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent colour — like grey, silver, or white — as it grows. … People can get grey hair at any age. So, why do we get grey hair in the first place?…