What Does The Letter 'A' Stand For On A Drill Bit?

You can find drill bits with imperial and metric units printed on them, but what about letters? Here's what an A (or B and so ...

Info to decipher secret message in Kryptos sculpture at CIA headquarters sells for close to $1M

The information needed to decipher the last remaining unsolved secret message embedded within a sculpture at CIA headquarters in Virginia sold at auction for nearly $1 million, the auction house ...
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Contrast sensitivity function in patients with macular disease and good visual acuity

Correspondence to Dr John B Miller, Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, USA; john_miller{at}meei.harvard.edu Introduction Contrast ...
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Ed Sheeran's open letter helps change the UK school curriculum for the first time in 10 years

The UK government has announced the first change to the school curriculum in over 10 years with music and arts now being available to all children to study at school. Now the government has responded, ...