Cretaceous-Paleogene extinction event

src: 1.bp.blogspot.com The Cretaceous-Paleogene ( K-Pg ) extinction event , also known as the Cretaceous-Tertiary ( K-T ) extinction , was...

Curtain

src: i.ytimg.com A curtain (sometimes known as a drape , mainly in the United States) is a piece of cloth intended to block or obscure ligh...

Photomultiplier

src: upload.wikimedia.org Photomultiplier tubes ( photomultipliers or PMTs for short), members of the class of vacuum tubes, and more spe...