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Holes in Swiss Cheese – level 2
05-08-2022 15:00
After old stories about hungry mice, many random guesses,...Holes in Swiss Cheese – level 3
05-08-2022 15:00
A Swiss agricultural institute made a revelation of why...Pictures of Pluto – level 3
25-07-2022 15:00
An animation released on the Internet illustrates the picture...How to cool cities – level 1
20-07-2022 07:00
The world is heating. More and more heatwaves happen...