Comets are 'dirty snowballs' — mixtures of ice, dust, and organic compounds.

The world's most popular fruit by weight consumed is the tomato, followed by the banana and watermelon.

The color of egg yolks depends entirely on the hen's diet — more carotenoids produce darker yolks.

The average person breathes about 22,000 times per day.

Narwhals use their tusks to stun fish before eating them, according to recent drone footage analysis.

Socrates never wrote down his teachings.

You are more likely to choke on food than win the lottery.

Vanilla is the second most expensive spice in the world after saffron, because each flower must be hand-pollinated.

Smart glass can switch between transparent and opaque using an electrical charge — reducing heating and cooling needs.