“Dad, is it really so that mass depends on energy?”, C. Adler, an American physicist was asked by his son.

“No! Or rather - yes. Actually it doesn’t, but don't tell your teacher about it”, C. Adler answered.

The next day the physicist’s son stopped studying physics.

From the article by L.B. Okun, published in the “Advances in Physical Sciences”, vol. 158, issue 3, 1989, pp. 511-530

Tuesday 14 June 2011

Freshwater fish part 1 - PIRAIBA

Largest  Amazon's catfish

Fish Files;


Length: Up to almost 3 meters.

Weight: Up to 450 lbs.

Colour: Silvery gray on lateral body, dorsally slightly darker . Abdomen white. Reddish markings on lips.

Population: Brazil, Venezuela, Colombia, Ecuador, Peru, Guyana.

River Basins: Amazon, Orinoco and Essequibo drainage.

Posted by at 18:50

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