Like Rodin's 'The Thinker,' Perched on a pot, When lost in deep thought, I'm the best spot to squat

You mostly know me in my synthetized and comercialized form, but but you should know me as an animal useful for filtering the sea - just like you know that I can clean your skin or your countertop.

Ain’t nobody cool as me unless they’re known for being level headed. Long and green, crunchy and delicious. Sweet or sour, sometimes that bite can be vicious.

Airline. Change. River. Slope. Triangle. Discriminant. Particle. Is it just me, or am I starting to sound Greek?

In hallways where the holy gather, you might bump into a Father. I could be green in the middle, can you solve this strange riddle?