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Silver. Tinsel was invented in Nuremberg around 1610 and was made of thin strands of real silver.

Green-dyed goose feathers. These feather trees came from Germany, partly as a response to deforestation there.

No, it existed before. Artists drew Santa in red with white fur decades earlier. Coca-Cola's ads from 1931 only made the look even more famous.

A captain sailed past it on 25 December. Captain William Mynors sailed past the island on Christmas Day 1643 and gave it its name.

The Greek letter chi. Chi looks like an X and is the first letter of Christos, the Greek word for Christ.

A super-strong glue. Spencer Silver wanted a super-strong adhesive and got a weak, reusable one instead. Years later it became the sticky note.

A moth. The moth was stuck in a relay. It was taped into the logbook with the note "First actual case of bug being found".

A coffee pot. From 1991 a camera watched the coffee pot in the University of Cambridge computer lab, so nobody walked to an empty pot again.

Wallpaper. The inventors sealed two shower curtains together and tried to sell it as wallpaper. That flopped, and it later became packaging.

16. A0 has an area of one square metre. Each size down is exactly half, so A4 fits in 16 times.

What happens when a few own all the land. Elizabeth Magie designed it as a critique, to show how land held by a few harms everyone else.

Play well. It comes from the Danish "leg godt", meaning "play well". The company took the name in 1934.

US President Theodore Roosevelt. "Teddy" was Roosevelt's nickname. He actually disliked it.

Wallpaper cleaner. It removed coal soot from wallpaper. When homes stopped heating with coal, it was turned into modelling dough for children.

Maps. London mapmaker John Spilsbury mounted world maps on wood and cut out the countries, so children could learn geography.

Clear. Ice is clear. Snow only looks white because the many crystal faces scatter light in every direction.

The Arctic. Penguins live almost only in the Southern Hemisphere. The Galápagos penguins at the equator are the furthest north.

Early January. Seasons come from the tilt of the Earth's axis, not the distance. So it is winter in the Northern Hemisphere while the Sun is closest.

They turn blue. The reflective layer behind the retina changes from gold in summer to blue in winter, which helps reindeer see in the long darkness.

A desert. So little precipitation falls there that Antarctica counts as a cold desert, despite all the ice.