"We live on the edge, perched on the boundary between planet Earth and the rest of the Universe. ...Every human civili…"

"My favorite element is . That's mainly because of this organism... a ... a tiny... organism that lives in the surface…"

"[A]ll of these platelets, this really intricate structure... is made of so calcium is incorporated into this structur…"

"This organism lives, and it dies, and quite often when it dies, the broken fragments... drift down... and... can buil…"

"[M]ost of the south coast of England is underlain by a great layer of this calcium carbonate, mostly made of this one…"

"So after the calcium has been part of the cliffs it can crumble down... It goes back into the ocean and this cycle st…"

"Humans have found this a very useful material. Drawing this diagram with this piece of is a lovely thing to do becaus…"

"[T]here are these very famous images in ' of s swimming, and they've always got these trailing bubbles. ...[N]o one r…"

"And then they go down, and they go hunting for fish... [I]t comes time to go back up to the surface and hop out onto …"

"So penguins use bubbles, and I think that's brilliant!"