Saturday Links

Our species has been on earth for only about 300,000 years; but 2.6 million years ago, our pre-human ancestors were making stone tools. This sweep of history by Matt Yglesias is recommended

Two things have grown dramatically over the past decade: the number of people with health insurance and the number of pharmacies getting discounted drugs because they service uninsured patients. The 340B program is costing Medicaid $32 billion a year – mainly because of perverse incentives.

Positive and negative moods are contagious.

Woman has a bionic arm and hand, “which she uses confidently to open containers, make morning coffee, water plants and put her clothes on hangers.”