Think of a seed buried in a pot. Like this one:
It's dark down there in the potting soil. There's no light, no sunshine. So how does it know which way is up and which way is down? It does know. Seeds routinely send shoots up toward the sky, and roots the other way. Darkness doesn't confuse them. Somehow, they get it right...
More intriguing, if you turn a seedling (or a whole bunch of seedlings) upside down, as Thomas Andrew Knight of the British Royal Society did around 200 years ago, the tips and roots of the plant will sense, " Read More...
If you ask anyone who doesn’t watch American football to watch a game with you, chances are that they will have no clue as to what’s happening on the field. Unlike sports like soccer and basketball, American football is regulated with a complex set of rules. In addition to that, NFL head coaches develop unique and distinctive plays that are put into action by quarterbacks.
That’s why the league instituted the use of a radio helmet to allow for limited communication from the sidelines in 1994. Read More...