A 13-year-old in California shook her head at the TV. A 5-year-old in Pittsburgh asked her father why people are so angry. As America coped with one tragic moment after another this week, with the deaths of Alton Sterling and Philando Castile followed by the shooting of a dozen police officers in Dallas, the country's parents had an added task: explaining each act of violence to their children. "If [children] see a bunch of this on television, they can become the indirect victims of trauma," said Suzanne Silverstein, director of the Cedars-Sinai Psychological Trauma Center. African American children might be afraid for their own lives or for their friends and families when they see black men being shot.

Upwork just released our quarterly list of the 20 fastest-growing skills in the U.S. freelance market. This list is a snapshot of what companies most value and need in their freelancers, and it reflects the top tech and business trends of today. But I've been thinking about the future of work as well as the present day. I just returned from the World Economic Forum meeting in China, where I caught a glimpse of the kinds of technologies that will shape our world in five to ten years. Chief among those are virtual reality, artificial intelligence, and robotics.

Scientists are closer to creating a computer with emotions. Researchers in Russia are expected to reveal an emotional computer within a year and a half, which will be able to think like a person and build up trust, its creators say. The system, called'Virtual Actor', is being created by the National Research Nuclear University in Moscow. Computers are machines used for practical reasons, without any emotion involved. The AI, called'Virtual Actor', is expected to be online within the next year and a half.

Soon, when restaurant-goers hear "May I take your order?" those words may be coming from a robot. Some restaurants have started experimenting with human-like robots instead of human cashiers, allowing consumers to pay for their meals without interacting with another person. Although many restaurants have allowed digital ordering, either online, by kiosk or on tablets at the table, the practice of using humanoid, or human-like robots, is still in its earliest stages, and it's primarily happening in Asia so far. Experts say the robots could benefit restaurants and lead to wider adoption -- if diners aren't too freaked out by them. Pizza Hut YUM, 1.74% is the latest company to try a robot cashier, in a partnership with robotics company SoftBank Robotics and MasterCard MA, 0.76%, which has created the payment app. The application works only with MasterCard's MasterPass, a digital wallet that allows payment by MasterCard cards, as well as credit, debit or prepaid cards from Maestro, American Express AXP, 2.84%, Diner's Club, Discover DFS, 3.36% and Visa V, 2.46% .

Editor's note: Before continuing, you may first want to read part 1 of this in-depth overview here. NovuMind and Numenta were the only AI companies we visited during this Silicon Valley trip, but even though we were only there for a limited time, we were still able to gain some insights on the developmental trends of AI and deep learning. After Dr. Wu departed from Baidu, he founded the startup NovuMind to focus on deep learning and AI technologies. I accompanied TalkingData's CEO Leo Cui, Mr. Che Pingjue, and Beijing GZT Network Technology's Vice Chairman, Mr. Li Yangshong on their visit to NovuMind. Leo is an excellent go player (ranked at amateur 5-dan).

Negotiators had been talking for hours with the hunkered-down killer of five police officers in downtown Dallas when the man suddenly resumed firing with an assault rifle. Fearing additional casualties, the officers deployed a small, remote-controlled robot to carry an explosive device near shooter Micah Xavier Johnson, which they then detonated, killing him. "We saw no other option but to use our bomb robot and place a device on its extension for it to detonate where the suspect was," Police Chief David Brown said at a news conference Friday morning. "Other options would have exposed our officers to grave danger .… We have confirmed that he's been deceased because of the detonation of the bomb."

In this still image from video provided by NBC DFW, police officers salute their fallen peers outside Parkland Memorial Hospital in Dallas, where several officers were transported after shootings at a protest late Thursday, July 7, 2016. Five Dallas police officers were fatally shot and seven others wounded during a protest over the deaths of black men killed by police this week in Louisiana and Minnesota. It was the deadliest day for U.S. law enforcement since the Sept. 11, 2001, terrorist attacks. In this still image from video provided by NBC DFW, police officers salute their fallen peers outside Parkland Memorial Hospital in Dallas, where several officers were transported after shootings at a protest late Thursday, July 7, 2016. Five Dallas police officers were fatally shot and seven others wounded during a protest over the deaths of black men killed by police this week in Louisiana and Minnesota. It was the deadliest day for U.S. law enforcement since the Sept. 11, 2001, terrorist attacks. John Fife hands a police officer guarding Jack Evans Police Headquarters a rose in Dallas on Friday July 8, 2016. Snipers opened fire on police officers in the heart of Dallas during protests over two recent fatal police shootings of black men. Investigators leave the home of Micah Xavier Johnson in the Dallas suburb of Mesquite, Texas, Friday, July 8, 2016. A Texas law enforcement official identified Johnson, 25, as the sniper who opened fire on police officers in the heart of Dallas during protests over two recent fatal police shootings of black men. Dallas police respond after shots were fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said.

Your Amazon deliveries may be delivered by drone sooner than you think - if rumours that the retail giant have just begun testing UAVs in a top secret field UK location are to be believed. An air traffic alert for UAV testing near Amazon's HQ in Cambridge today sparked speculation that the retail giant is already testing its delivery drones in the UK. The revelation comes as the race between Google and Amazon to use the technology for 30 minute deliveries intensified. Google announced it will begin using the devices by next year, putting the heat on tech rival Amazon to roll out its technology as soon as possible. Amazon claims it will be ready to start using drones by the middle of next year.

Nasa has announced that it has found evidence of flowing water on Mars. Scientists have long speculated that Recurring Slope Lineae -- or dark patches -- on Mars were made up of briny water but the new findings prove that those patches are caused by liquid water, which it has established by finding hydrated salts. Several hundred camped outside the London store in Covent Garden. The 6s will have new features like a vastly improved camera and a pressure-sensitive "3D Touch" display

Snipers opened fire on police officers in the heart of Dallas Thursday night, during protests over two recent fatal police shootings of black men. Snipers opened fire on police officers in the heart of Dallas Thursday night, during protests over two recent fatal police shootings of black men. Police and others gather at the emergency entrance to Baylor Medical Center in Dallas, where several police officers were taken after shootings Thursday, July 7, 2016.. (AP Photo/Emily Schmall) A police officer looks up while standing behind a vehicle, as police responded to shots being fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said. Dallas police respond after shots were fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said. Dallas police respond after shots were fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said.