Bored Panda on MSN16 小时
32 Rare Historical Photos That Show Why Flying On The Hindenburg Zeppelin Was So Expensive
In the beginning of the 20th century, if you wanted to cross the Atlantic, you bought a trip on a ship. But after British ...
idw22 小时
Assessing the stability of power grids with high levels of renewable energy: project launch ...
The demand of the power grid in Europe is undergoing profound changes: An increasing number of decentralized feed-in points and the fluctuating supply from renewable energies are making the ...