Unknown Things Number 1.

Day 1,556, 09:35 Published in Switzerland Switzerland by Comrade Vladimir Ulyanow Lenin

The Slinky.
Slinky or "Lazy Spring" is a toy consisting of a helical spring that stretches and can bounce up and down. It can perform a number of tricks, including traveling down a flight of steps end-over-end as it stretches and re-forms itself with the aid of gravity and its own momentum.
The Pordenone.
3896 Pordenone (1987 W😎 is a main-belt asteroid discovered on November 18, 1987 by J. M. Baur at Chions.
Unbibium
Unbibium, also referred to as eka-thorium or element 122, is the temporary name of a currently unknown chemical element in the periodic table that has the temporary symbol Ubb and the atomic number 122.

In 2008, it was claimed to have been discovered in natural thorium samples[1] but that claim has now been dismissed by recent repetitions of the experiment using more accurate techniques.

Epoxy
Epoxy, also known as polyepoxide, is a thermosetting polymer formed from reaction of an epoxide "resin" with polyamine "hardener". Epoxy has a wide range of applications, including fiber-reinforced plastic materials and general purpose adhesives.

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