Environment

The term 'coat of arms' can be traced back to the 12th century, with the start of heraldic tradition arising from the Crusades. The crusaders were dealing with the self-identification issues at the time - they needed to know who was the one who accomplished the 'feat' and who was who on a level resembling modern 'friend-or-foe' systems.

One would ask, what mystery may little cast-iron statuettes, known as 'Capuchin Foxes', hold?

One hundred and seventy-three years ago, in 1848, Nikifor Syutkin, a worker at the state-owned Miass gold mines, was, just as usually he did, digging for gold. Suddenly he heard a tinkling sound from underneath his pickaxe. When he shook the dirt off the find, he barely managed to elevate a 36-kilogram gold nugget up the wooden ladder.

The correct answers are as follows: on the window glass and in December. If, while the temperature is above zero, and provided the air humidity is high, a water film forms on the glass surface, then, once the temperature drops below freezing, the film may turn into a dendrite-like frost pattern.

This stone was considered sacred by members of the most mysterious medieval order - the Knights Templar. It comes as no surprise since the rock may change its colour in a matter of a few minutes.

This rock may occur as below the Earth's surface as in space, too. For centuries humanity was tricked into thinking it was a precious mineral.