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It would have been helpful to mention in this article that the free-PSA-ratio test is effective only for men with a prostate volume less than 40 cubic centimeters. The test doesn’t work for men with larger prostates. This is because, for larger prostates, the ratio of free to total PSA is elevated to roughly the […]
- Math
Hiding in DNA
Spies might have to start boning up on molecular biology to pass along and decipher secret messages. During World War II, German spies used microdots to hide information in plain view. Consisting of a greatly reduced photograph of a typed page, a microdot could be pasted on top of a printed period at the end […]
- Math
Hiding in DNA
Spies might have to start boning up on molecular biology to pass along and decipher secret messages.
