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Google’s cuddly-looking robotic cars have taken a big step on the way to developing a harder edge: they’ve learned to honk. In the Google Self-Driving Car Project’s latest monthly report (PDF), the company says it has been testing horn algorithms in its prototype cars for some time, playing the horn sound inside the cars as a way to make sure they’re not beeping in a way that would confuse other drivers. As the algorithm has improved, the cars have recently begun “broadcasting our car horn to the world.”

A proposal by a group of scientists and businesspeople to synthesize a human genome from scratch is attracting sharp criticism for dodging the big ethical questions such a step raises. The proposal is to string together synthetically made DNA and shape from it a human genome able to power a cell in a dish, according to lead authors Jef Boeke of New York University’s Langone Medical Center and biotechnologist George Church of Harvard Medical School.

Metal 3-D printing, which has been around for decades, is finally coming into its own as a genuine mass manufacturing technology: Sales of machines that print metal objects have risen rapidly as manufacturers, especially in the aerospace industry, gear up for commercial production of additively made parts they’ve been developing for years.

This week at Facebook’s annual developer conference, F8, in San Francisco, CEO Mark Zuckerberg laid out the social network’s plans for the next decade. Here’s how he plans to keep the more than 1 billion people that use Facebook every day engaged - and lure in still more users.

A startup called Zipline will use a fleet of long-distance drones to airdrop precious blood and medicines to remote medical facilities across Rwanda. The potentially life-saving project hints at the potential for unmanned aerial vehicles to revolutionize the delivery of some goods. But it also highlights the fact that drone delivery currently makes most sense only in extreme situations.

From the street, through Beijing’s heavy smog, it can sometimes be hard to make out IBM’s Chinese headquarters: a towering office building with a distinctive undulating architectural flourish and a large company logo at the top. But just a short distance away, on the northeast outskirts of the capital, IBM computer scientists are using artificial intelligence to develop what they think will be a way to manage China’s notorious and chronic pollution problem more successfully.

A video posted to YouTube last year provides proof that some people can’t be trusted behind the wheel even when their car is doing all the driving.

A colleague recently described a fun Friday night for his teenage son: staying home and chatting online. Every now and then there’s a party where all his friends talk on their laptops.

Engineers at Harvard have developed a soft robotic glove that allows people with limited hand mobility to grasp and pick up objects. The device could help the estimated 6.8 million people in the United States who have hand mobility issues, whether from a degenerative condition, stroke, or old age.

The Human Genome Project was one of mankind’s greatest triumphs. But the official gene map that resulted in 2003, known as the “reference genome,” is no longer up to the job.

A genetically modified potato that could resist destructive blight, defend itself against parasitic worms, avoid bruising, and cut down on the accumulation of a suspected carcinogen during cooking would be worth many billions of dollars per year to potato producers across the world.

The way Hod Lipson describes his Creative Machines Lab captures his ambitions: “We are interested in robots that create and are creative.” Lipson, an engineering professor at Cornell University (this July he’s moving his lab to Columbia University), is one of the world’s leading experts on artificial intelligence and robotics.

For all the remarkable progress being made in artificial intelligence, and warnings about the upheaval this might bring, the smartest computer would still struggle to make it through the eighth grade.

Might the communities of microörganisms living in healthy plants hold the keys to dramatically increasing crop yields? A new venture-backed company is betting yes. Indigo, a Cambridge, Massachusetts-based startup, is developing microbe-based crop treatments identified through the study of the beneficial bacteria and fungi - collectively known as the microbiome - that naturally live in and around plants.

If all goes according to plan, sometime next month a surgeon in Texas will use a needle to inject viruses laden with DNA from light-sensitive algae into the eye of a legally blind person in a bet that it could let the patient see again, if only in blurry black-and-white.

Facebook keeps its map of the social connections of the 1.6 billion people who use the service each month to itself. But it is giving away for free new maps it is building that describe patterns of population density in the world’s poorest countries in unprecedented detail.

The airy Berkeley office space of startup Rigetti Computing boasts three refrigerators - but only one of them stores food. The other two use liquid helium to cool experimental computer chips to a fraction of a degree from absolute zero. The two-year-old company is trying to build the hardware needed to power a quantum computer, which could trounce any conventional machine by tapping into quantum mechanics.

A controversial genetic technology able to wipe out the mosquito carrying the Zika virus will be available within months, scientists say. The technology, called a “gene drive,” was demonstrated only last year in yeast cells, fruit flies, and a species of mosquito that transmits malaria. It uses the gene-snipping technology CRISPR to force a genetic change to spread through a population as it reproduces.

If a team of researchers gets its way, the activist networks of the future could be organized by Twitter bots. A recent study published by Microsoft details a cohort of Twitter bots that targeted and challenged people who tweeted about government corruption in Latin America to take specific action. Some bots asked for potential solutions from the tweeters, while others offered messages of solidarity. The researchers dubbed the system “Botivist.”

Gary Marcus became fascinated by the mind in high school after reading The Mind’s I, a collection of essays on consciousness edited by the cognitive scientist Douglas Hofstadter and the philosopher Daniel Dennett, as well as Hofstadter’s metaphorical book on minds and machines, Gödel, Escher, Bach. Around the same time, he wrote a computer program designed to translate Latin into English.