There are enough veins in the human body to go around the earth twice.
You can train a reflex by associating it with something good or bad (If you fed a dog and every time while you were feeding it you rang a bell, after a while, it will start drooling just because you ring a bell)
Most people know the 4 tastes that are detected on our taste buds (salty, sour, bitter and sweet) but there's a 5th taste called Umami that is only recently being known as the 5th taste.
You can train a reflex by associating it with something good or bad (If you fed a dog and every time while you were feeding it you rang a bell, after a while, it will start drooling just because you ring a bell)
Most people know the 4 tastes that are detected on our taste buds (salty, sour, bitter and sweet) but there's a 5th taste called Umami that is only recently being known as the 5th taste.