Everyone's heard of a zipper (no, it's not the super-fast building with towers), but have you heard of a lightning bolt? Probably not, because that name just popped into our heads when we decided to tell you about fulgurites (fulgurite is actually the common name in science).

If we were in Europe at the end of the Jurassic period and had a precise map, it would have been difficult to figure out where we were. Much of the continent remained underwater, and the small expanses of land, separated by seas, were carved into by bays of the now-vanished Tethys Ocean.

It is one of the most famous iron meteorites found on Earth. It is believed to have struck our planet's surface around 4,000 years ago, but was likely formed around 4.5 billion years ago, during the formation of the protoplanetary disk!

Although the Ediacaran fauna are the first mass-produced multicellular organisms, their appearance on Earth dates back to about 600 million (0.6 billion) years ago, at the very end of the Precambrian. However, we know that multicellular organisms appeared on Earth much earlier. These include Grypania from 2.1 billion years ago, interpreted as an algal thallus, and Horodyskia, which appeared between 1.5 and 0.9 billion years ago, sometimes interpreted as a fungus, but sometimes as a bacterial colony.

When visiting the Baltic coast, we have the opportunity to meet three species of mammals from the seal family, belonging to three genera. These are: the grey seal (Halichoerus grypus), the harbor seal (Phoca vitulina) and the ringed seal (Pusa hispida).