Bedbugs' Favorite Color, Micro Thermometers & More: 5 Things We Learned This Week

edward snowden encryption james clapper
US National Security Agency (NSA) whistleblower Edward Snowden speaks to European officials via video conference during a parliamentary hearing on improving the protection of whistleblowers, at the Council of Europe in Strasbourg, eastern France, on June 24, 2014. FREDERICK FLORIN/AFP/Getty Images

From the impact of Edward Snowden's revelations to a tiny thermometer made from DNA, here are five things we learned in Tech and Science this week:

  • If you want to keep bedbugs at bay, use green, yellow or white linens. A study in the Journal of Medical Entomology shows that the hated critters vastly prefer black and red; black because it mimics darkness, and red is likely a suggestion of other bedbugs due to the reddish hue of their exoskeleton. The study could be used to design more useful traps rather than the white ones in circulation: "exactly the opposite of what you'd want," says study first author Corraine McNeill.
Bedbugs have two favorite colors: black and red, which signal darkness and the presence of other bedbugs, respectively. Piotr Naskrecki
  • People who have suffered a traumatic brain injury (TBI) may experience problems sleeping for long after the injury, according to a study in Neurology. While that seems logical, perhaps the most interesting finding is that those with brain injuries didn't report feeling any sleepier than those who weren't injured; the study authors propose including sleep lab evaluations for those who have suffered traumatic brain injuries. They theorize that TBI damages the part of the brain that regulates sleep patterns.
head injury
A new study suggests serious traumatic brain injury can cause long-term sleep problems. Mike Blake/REUTERS
world's smallest thermometer DNA nanothermometer
Researchers from the University of Montreal were able to create a microscopic thermometer using strands of DNA. It will be used to monitor what happens inside the human body at a cellular level. REUTERS/Kai Pfaffenbach