The human brain’s time cells help us recall episodic memories. Time cells have been found inside human brains which allows us to track the flow of time and sequence of events, according to a new study led by scientists in France.
It has been suggested by an old fish fossil that teeth did not develop within the mouth. There are two hypotheses about the genesis of teeth: either they emerged from internal sources (the outside-in theory) or exterior scales (the inside-out hypothesis).