Matter & Energy

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tetraneutrons

NO PROTONS ALLOWED  The collision of two varieties of helium nuclei at a Japanese lab produced beryllium nuclei and tetraneutrons, nuclei with four neutrons but no protons. This illustration depicts the number of protons and neutrons but not their actual positions within each nucleus.

General Fusion Reactor

RENEGADE FUSION  Private-sector startups, like General Fusion, are betting they can develop an energy source for the future faster than government-funded projects. General Fusion's prototype (shown) uses pistons that converge on magnetized, superhot plasma.

entanglement experiment

Physicists in the Netherlands performed quantum entanglement experiments using electrons in diamonds located at labs (left and right of aerial photo) far enough apart to confirm that no hidden signal could be influencing the results.

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