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When you eat something loaded with sugar, your taste buds, your gut and your brain all take notice. This activation of your reward system is not unlike how bodies process addictive substances such as alcohol or nicotine -- an overload of sugar spikes dopamine levels and leaves you craving more. Nicole Avena explains why sweets and treats should be enjoyed in moderation.

Humankind has been looking for the giant squid (Architeuthis) since we first started taking pictures underwater. But the elusive deep-sea predator could never be caught on film. Oceanographer and inventor Edith Widder shares the key insight that helped to capture the squid on camera for the first time.

A female Amethyst-throated Sunangel (Heliangelus amethysticollis) sleeps in Peru.

A giant ant colony is pumped full of concrete, then excavated to reveal the complexity of its inner structure.

This week marks the 178th anniversary of Darwin's first exploration of the Galapagos Islands. This volcanic archipelago is one of the most biodiverse and unique places on the planet, with species that have remarkably adapted to their environment. Through observing the animals, Darwin made key insights that informed his theory of evolution. Here's a short documentary that captures the 10-day expedition: More info

You're doing it right now. It's time to learn something about it.

How high can you hear? Take this 'test' to see how old your ears are!

What is your theory about why there are holes in the cocoon?

For the first time, a large Pacific barreleye fish - complete with transparent head - has been caught on film by scientists using remotely operated vehicles at the Monterey Bay Aquarium Research Institute. The deep-sea fish's tubular eyes pivot under a clear dome.

I visited a butterfly farm and left a different man. Video of the entire process from egg to wing Inflation!!

As the narrative goes, fat is bad. Well, it's actually more nuanced than that. The type of fat you eat is more impactful on your health than the quantity. George Zaidan examines triglycerides, the varied molecules that make up fat, and how to identify which types of fat you are consuming.

First video released of new spider that builds decoys of other spiders!

All 39 species of New Guinea's spectacular birds of paradise have now been captured on film by renowned photographer Tim Laman and ornithologist Ed Scholes.