“After analyzing data from 2,074 testers, we found no evidence that Bionic Reading has any positive effect on reading speed.”
Bolding the first half of every word was supposed to supercharge reading. Across more than 1,900 valid testers, people read 2.6 words per minute slower with it, and comprehension was 88 percent either way. The hype went viral first and got tested second. Readwise did the test, and the result is nothing.