6. David Gallo: "Underwater astonishments"

http://www.ted.com/talks/david_gallo_shows_underwater_astonishments.html

1) A FIREFLY (n)
1. an insect that is active during the night and whose tail produces light:
Fireflies are often called lightning bugs.
Fireflies use bioluminescence to attract mates or prey.

2) A PREY (n)
1. an animal that is hunted and killed for for food by another animal:
A hawk hovered in the air before swooping on its prey.
2. the action or habit of preying: a beast of prey.

3) A CEPHALOPOD (n)
1. an animal such as an octopus or squid that has tentacles around the head:
Cephalopods are characterized by bilateral body symmetry and a set of  arms or tentacles (.
Sometimes fishermen call cephalopods inkfish, referring to their common ability to squirt ink.

4) DROOPY (adj)
1. bending or hanging down heavily: I can see you're tired because your eyelids are droopy.
2. sagging downwards: a droopy moustache.

5) A BLEND (n)
1. a mixture of different things or styles:
a rich blend of the finest coffee beans
Their music is a blend of jazz and African rhythms.