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Amplifier for terahertz lattice vibrations in a semiconductor crystal

In analogy to the amplification of light in a laser, vibrations of a semiconductor crystal, so called phonons, were enhanced by interaction with an...

FDA commissioner refuses to comment on Trump’s claim that 99 percent...

Trump calls 99% of COVID cases "harmless" in his July 4 speech. FDA Commissioner Stephen Hahn refused to comment on the claim.