JUDY WOODRUFF: A movie thriller being released nationally today delves into the practical, legal and moral issues surrounding drone warfare. HELEN MIRREN, Actress: We need to put a Hellfire through that roof right now. JEFFREY BROWN: It's a new kind of warfare, advanced technology that tracks, identifies, and has the power to destroy enemies by remote control from thousands of miles away. HELEN MIRREN: We have two suicide vests with explosives inside that house. JEFFREY BROWN: But as the film "Eye in the Sky" asks, should it be used?

Baidu Inc. BIDU 2.44 % will soon start testing autonomous cars in the U.S., part of the Chinese tech giant's effort to introduce a commercially viable model by 2018. The move, disclosed by Baidu's chief scientist Andrew Ng in an interview late Tuesday, is a significant step for the company, which is trying to get ahead in the race to build autonomous cars and is now calling on the resources of its Silicon Valley tech center to advance the effort. At the same time, Baidu is advocating for better coordination with the U.S. government, which the company says is necessary to get self-driving cars on the road. Central to the push is Mr. Ng, an artificial-intelligence scientist who conducted groundbreaking research at Stanford University and at Alphabet Inc. GOOGL -0.40 % 's Google. Late last year, Beijing-based Baidu became the latest technology company to publicize its intention to develop self-driving cars.

South Korean professional Go player Lee Sedol reviews the match with other professional Go players after the fourth match against Google's artificial intelligence program, AlphaGo. South Korean professional Go player Lee Sedol reviews the match with other professional Go players after the fourth match against Google's artificial intelligence program, AlphaGo. The five-game clash pitting man against machine is over, with Google's artificial intelligence program winning the series.The program -- called AlphaGo -- took four of five games against Korean Lee Sedol, an 18-time world champion of the board game Go. "I feel a little regrettable because I believe that there is more that a human being could have shown in a match against artificial intelligence," Lee said following the final match. The matchup had all the mood and atmosphere of a prize fight. And play-by-play announcers who analyzed every move.

Last summer, Jacky Alciné learned just how biased computers can be. Alciné, who is African-American, took a bunch of pictures with friends at a concert. Later he loaded them into Google Photos, which stores and automatically organizes images. Google's software is able to group together pictures of a particular friend, or pictures of dogs, cats, etc. But when it labeled a picture of one of Alciné's friends, who is also African-American, it left him speechless.

Google's Go-playing software defeated a human champion. Google's Go-playing software defeated a human champion. An artificially intelligent computer system built by Google has just beaten the world's best human, Lee Sedol of South Korea, at an ancient strategy game called Go. Go originated in Asia about 2,500 years ago and is considered many, many times more complex than chess, which fell to AI back in 1997. Google's programmers didn't explicitly teach AlphaGo to play the game. Instead, they built a sort of model brain called a neural network that learned how to play Go by itself. The Google program, known as Alpha Go, actually learned the game without much human help.

Gina Rodriguez as Jane and Brett Dier as Michael in the popular TV series Jane the Virgin, in which a shared online calendar was a plot point. Gina Rodriguez as Jane and Brett Dier as Michael in the popular TV series Jane the Virgin, in which a shared online calendar was a plot point. People in love have always savored their relationship milestones: the first date, the first I-love-you's, meeting each other's families. Modern relationships come with their own special milestones, like swapping Wi-Fi passwords, becoming Facebook official, taking down your online dating profiles, and increasingly often, choosing to share your online calendar. These days, more couples are discussing whether to make their online calendars visible to each other.

Midway through the first of five recent matches between Lee Sedol, a top-ranked professional Go player, and AlphaGo, a computer program conceived by Google DeepMind, an odd thing happened: Lee's jaw dropped, hanging open for a nigh-cartoonish twenty seconds, and then he laughed. AlphaGo had just mounted an aggressive, and evidently unexpected, attack. The moment was reminiscent of a famous episode in Go history, when Honinbo Shusaku, a future legend of the game, squared off against Inoue Genan Inseki, an older and more experienced player, in 1846. The story goes that a spectator--a local doctor who knew little of Go--correctly guessed that the seventeen-year-old Shusaku was beating Inseki. Asked how he knew, the doctor responded that, after an earlier move, Inseki's ears had flushed red, a clear indication of surprise.

This week, Google's Verily (formerly Google Life Sciences) and Ethicon, a Johnson & Johnson medical device company, announced the formation of a startup called Verb. "In the coming years, Verb aims to develop a comprehensive surgical solutions platform that will incorporate leading-edge robotic capabilities and best-in-class medical device technology for operating room professionals." But seriously, that's not much to go on, so let's see what we can piece together from the press releases put out from the various companies involved. It's Taurus, from SRI Robotics, which (according to a press release) "is licensing next-generation robotics technology to Verb Surgical that we believe will impact both the open and minimally invasive surgery markets and ultimately make the benefits of robotic surgery accessible to more patients around the world." While Taurus, originally designed as a bomb-disposal robot, is very much not a surgical robot in its current implementation, it represents several technologies that are very valuable in a surgical context: highly dexterous small manipulators and an advanced teleoperation system with haptic feedback.

Most of the world's robots are about as charismatic as a coffeemaker. Nexi is baby-faced and blue-eyed, and Leonardo has been described variously as a squirrel, a furry alien, and a giant Furby. After years of making emotionally engaging machines with her students at the MIT Media Lab's Personal Robots Group, Breazeal thinks the time has finally come for a personal robot to inhabit our homes and help us live our lives. To pursue that goal, she founded Jibo, a Boston startup that has raised US 38.6 million to produce a friendly robo-assistant to families. Equipped with cameras and microphones, the robot, also called Jibo, is a little taller than a toaster and shaped like a desk fan.

UPDATED 12/23/15: More robot holiday videos added! This week, we've collected a whole bunch of holiday-themed robot videos from around the Internet. If we missed yours, send it to us, or post a comment and we'll add it. We're going to take some time off over the next week, but we'll be back in force with January, with in-depth coverage of whatever robots happen to show up at the Consumer Electronics Show, which kicks off the first week of 2016. We'll also take a look back at 2015, and let you know what our plans are for the next year.