:18:21
You alright? - Yeah, I'm alright.
:18:31
We could go to my place. You can
sleep over. - No, I'm OK. I'll be off.
:18:37
Go home.
:18:40
Martin?
:19:00
Despite being almost totally submerged,
:19:03
they can breathe, smell, see and hear.
:19:07
They sink down silently,
:19:09
their lungs holding enough
air for 5 minutes.
:19:13
Buoyancy and gravity are
more or less equal.
:19:18
Above water, there's turmoil again.
:19:20
Hippopotamuses are known
for their aggression.
:19:24
Their powerful jaws and sharp
teeth are dangerous weapons,
:19:29
but most scuffles end peacefully.