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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