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Squirrel image gallery II

Squirrel image gallery II
A clever creature that sadly can't be seen in many places. With little ones that only weighs a couple of dozen grams or others surpassing a kilogram, the squirrel likes a lot dried fruits, flowers, seeds and fruits, so more or less vegetarian if you don't account milk or little…
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The strength of concrete

The strength of concrete
It's usually measured in MPa, megapascals, to determine strength for compression most of the time. There are different grades, from 20 to 50 MPa until high efficiency with more than 125 Mpa. It's a matter of selecting the right conditions and recipe of materials. The difference between concrete comes very…
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