On the wall or on your phone Tells you to be somewhere or be at home The mayans had one that said In year two thousand and twelve we'd all be dead

In mythology, I am part lion, part goat, and part serpent. In biology, I am born in Petri dishes from mingled cells. Symbolically, I represent chaos and unrealistic dreams.

Riddle me this: a ringtone for Archimedes' heart?

forget forging and folding when fending off foes. everyone else elicits our expertise, in exercising exacting, exquisite, exertion. I come before steel, and I help hone an edge; before me, things were more fragile.

I move through the night without a sound, Where I step, no footprint is found. Wrapped in shadows, a blade by my side, In the smoke and the silence, I choose to hide. What am I?