Iterating over set bits quickly
21 February 2018 | 3:58 am

A common problem in my line of work is to iterate over the set bits (bits having value 1) in a large array. My standard approach involves a “counting trailing zeroes” function. Given an integer, this function counts how many consecutive bits are zero starting from the less significant bits. Any odd integer has no … Continue reading Iterating over set bits quickly

Science and Technology links (February 16th, 2018)
17 February 2018 | 12:40 am

In all countries, in all years–without exception–girls did better than boys in academic performance (PISA) tests. Vinod Khosla said: There are, perhaps, a few hundred sensors in the typical car and none in the body. A single ad shown to you on Facebook has way more computing power applied to it than a $10,000 medical … Continue reading Science and Technology links (February 16th, 2018)

Science and Technology links (February 9th, 2018)
10 February 2018 | 12:23 am

We shed 50 million skin cells every day. A mutant crayfish reproduces by cloning. To my knowledge, this might be the largest animal to reproduce by cloning. Before about 25 years ago, the species simply did not exist (…) it has spread across much of Europe and gained a toehold on other continents. In Madagascar, … Continue reading Science and Technology links (February 9th, 2018)


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