This weekly digest is comprised of hand-picked stories CNET news editors have determined to be the biggest stories of the week. Get all the latest tech news at
  1. Your refusal to join Twitter is taking a toll
    It's popular with entertainers, politicos and hipsters, but Twitter is having a hard time getting regular people to join. That's a big problem.
  2. Einstein nailed it! Gravitational waves do exist
    Scientists prove Einstein's theory after observing the collision of black holes.
  3. How to keep your geek happy on Valentine's
    Smitten with a geek? Take care how you treat us. We love as fiercely as Vulcans but can just as easily turn into rabid Ewoks.
  4. The strange journey of a Martian-in-training
    Physicist and comedian Josh Richards is ready and willing to die on Mars. But first he has to survive a see-through, mocked-up habitat in Sydney.
  5. Cloud-savvy Robin phone is set to fly. Good luck catching one
    Kickstarter darling Nextbit, which boasts a phone with massive cloud storage, will launch its online store with just 3,000 to 6,000 phones.