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Showing posts from October, 2014

Difficulties in mathematics...

Massive solar flare disrupts worldwide HF radio communication

Inventions have been the product of experiment and work based on physical reasoning...

Simplicibus...

Phonetic Alphabet Viewer iPhone app for learning the international phonetic alphabet

Light consists in the transverse undulations...

From failure to failure...

The first baby monitor

California QSO Party

October 7-8, 2014, the Draconids