Yousaf Butt


<p> Yousaf Butt is a nuclear physicist who serves as a scientific consultant for the Federation of American Scientists. The views expressed are his own. </p>
Articles by Yousaf Butt
JOE KLAMAR/AFP/Getty Images
JOE KLAMAR/AFP/Getty Images
Patrick Lux/Getty Images
Patrick Lux/Getty Images
ALEXANDER KLEIN/AFP/Getty Images
ALEXANDER KLEIN/AFP/Getty Images

Building Blocks

National Archives
National Archives

Radioactive Decay

Uriel Sinai/Getty Images
Uriel Sinai/Getty Images
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