Number of the day 11,600 That’s how many solar cells are used to power the experimental aircraft Solar Impulse, below, which completed a test flight on Monday in Switzerland. The four-engine, single-seat plane achieves…
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Number of the day 11,600 That’s how many solar cells are used to power the experimental aircraft Solar Impulse, below, which completed a test flight on Monday in Switzerland. The four-engine, single-seat plane achieves…