Greenland asteroid impact, short people in the rainforest, reef islands and sea level, stealth moths, walking on water and climbing the walls and is the night sky changing?

Quirks and Quarks

An asteroid impact on Greenland left a massive crater under the ice; Will coral reef islands rise or fall? It's a greenhouse-gas paradox; How moths evolved a kind of stealth jet technology to sneak past bats; Tiny people have evolved in rainforests because it's where tiny steps are better; The mysteries of animal movement - how they walk on water and climb up walls; What are the visible changes in the night sky in the last 3,000 years?

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