Are you a teacher who wants to promote spatial thinking with your students? Then this challenge is for you: Build a 3D object that casts exactly the same shadows as an unknown original.
D'Kontinenter bleiwen net fix op enger Plaz. Se driften – lues, mee konstant. Wéi wäit komme se an enger Millioun Joer? A wou läit dann de Grand-Duché? E Bléck an déi geologesch Zukunft.
