🌍 Who is often credited with creating the solar panel in 1954? 🌞
Difficulty: Easy💨 Which engineer is known for creating one of the first successful electricity-generating wind turbines in the U.S. in 1888? ⚡
Difficulty: Medium🌱 In response to the 1973 oil crisis, which innovation helped popularize biomass pellets as an energy source? 🔥
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