Friday 20 May 2016
Pebbles that make a good road
Friedrich Mohs, a German mineralogist, developed the Mohs scale of hardness in 1812. He selected ten minerals of distinctly different hardness that ranged from a very soft mineral (talc) to a very hard mineral (diamond). With the exception of diamond, the minerals are all relatively common and easy or inexpensive to obtain.
Saturday 14 May 2016
Friday 13 May 2016
When the heart is full, the eye overflows אַז דאָס האַרץ איז פֿול, גייען די אויגן איבער
Thursday 12 May 2016
Wednesday 11 May 2016
Tuesday 10 May 2016
Monday 9 May 2016
Sunday 8 May 2016
Saturday 7 May 2016
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