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Hop in a taxi and your experience will typically feature the following: a chatty driver with opinions on almost everything, a route that takes what feels like a hundred turns, and no dashboard GPS device to guide the cabbie through the city's labyrinthine streets.

For all that, you can thank the Knowledge, a 153-year-old system for memorizing every street and landmark in a six-mile area of central London. The Knowledge requires all cabbies to navigate between any two points in the city entirely from memory. Hopeful drivers study for three to fours years, traverse London on a motor scooter to learn the shortest routes across town and are required to pass a series of intense oral exams -- all before they can get behind the wheel of a taxi. It's a process unmatched anywhere in the world.

Before you can drive one of these, you have to learn every street in London.

Amazon looks to be moving deeper into the shipping world.

The online retailer plans to launch a program called "Shipping with Amazon" in Los Angeles in a few weeks, in which the company will pick up and ship packages to customers, according to a report from The Wall Street Journal. The service, which will expand to more cities as soon as this year, would start with third-party sellers on Amazon but could eventually open to other businesses, the report said.

The program seems to mesh with Amazon's efforts to build up its own shipping infrastructure so it can handle the growing mountains of packages it needs to deliver. Last year, more than 5 billion items shipped with its Prime program worldwide, the company has said. Amazon has invested in a new air cargo hub in Kentucky, 40 Prime Air cargo planes and 4,000 truck trailers. It also runs its own on-demand local delivery service called Amazon Flex. Longer term, Amazon is among a handful of companies including UPS and DHL that are developing delivery drones.

Amazon started investing in these resources after the 2013 holiday season, when some of its packages were delivered late by its shipping partners. That work should help ensure customers packages will arrive on time more often.

"We're always innovating and experimenting on behalf of customers and the businesses that sell and grow on Amazon to create faster lower-cost delivery choices," an Amazon spokeswoman said Friday, without confirming whether Shipping with Amazon was in the works.

But, even with those growing investments, there's strong reason to believe Amazon will need to rely on UPS, FedEx and the US Postal Service for many years to come. Amazon would need to significantly amp up its investment in shipping to match those other organizations, several analysts said.

Rogers, Nest's chief product officer, co-founded the company in 2011 with former CEO Tony Fadell, after leaving Apple the year before. The two played key roles in the development of the iPod. Rogers was also one of the first engineers of the original iPhone and iPad. 

The departure of Rogers, Nest's last remaining co-founder, marks the close of a chapter for the company. Google bought the buzzy startup in 2014 for $3 billion, in an effort to bring more hardware chops to the search giant. But Nest's tenure there has been rocky. Fadell left the company in 2016 after much turmoil and public drama. For example, he feuded with Greg Duffy, CEO of Dropcam, the smart camera company Nest bought later that year. After Duffy left Nest, he called his decision to sell the company a "mistake."

Fadell was replaced with Marwan Fawaz, a former Motorola executive. On Wednesday, Alphabet said it was reuniting Nest with Google, after three years of Nest being a semi-independent unit. As part of the change, Fawaz will now report to Rick Osterloh, the head of Google's hardware division, responsible for all the company's consumer devices, including the Google Home smart speaker and Pixel smartphones. 

Rogers on Thursday said he'll be focusing on Incite, an investing organization that has three arms, each of which focuses on a different area. Incite Ventures is a fund that backs "mission-driven enterprises;" Incite Labs is a nonprofit that extends grants for charitable, educational and scientific purposes; and Incite Politics organizes and supports "initiatives to pass legislation and elect candidates who approach our country's issues from a fresh perspective."

It didn't take too long for the live camera feed on Elon Musk's cherry-red Tesla Roadster to cut out as the car drove deeper into space. The car was launched on Tuesday from the SpaceX Falcon Heavy rocket, and Musk posted a farewell photo of the roadster on Instagram on Thursday. But that's not the last look we'll ever get at the Tesla.

The Virtual Telescope Project, which allows for real-time internet access to a group of robotic telescopes, posted a series of images on Friday of the Tesla as seen by the Tenagra Observatories in Arizona. The red roadster appears to the telescope's eye as a tiny white dot.

The Virtual Telescope Project says the Tesla was "quite bright." It released a GIF showing the Tesla moving across space, looking a lot like a comet or asteroid. The GIF strings together 54 images captured by Tenagra.

No, the new feature being tested isn't a thumbs-down "dislike" button.

Claudia Cruz/CNET

It's one of the easiest ways to express your opinion: like or dislike.

Yet for a more than a decade, Facebook only offered the happier option, the thumbs-up. That's about to change.

The social networking giant is testing a new feature that lets some people register a negative reaction to comments with a button called "downvote."

The goal, Facebook said, is to allow people to weigh in on comments people leave on public pages, like those for President Donald Trump. When selected, the button offers reporting options like "offensive," "misleading" and "off topic."

"We are not testing a dislike button," a Facebook spokesperson said in a statement. "We are exploring a feature for people to give us feedback about comments on public page posts."

Facebook is currently only testing this feature in the US, with a small number of people using its app on Android-powered phones.

The move marks yet another way Facebook is hoping to spur more interaction on its site, and keep its users happy. Offering easy ways for people to mark comments as "offensive" and "misleading" may help quell users' concerns about harassment, as well as the impact of Russian propagandists who used the site to spread misleading information during the 2016 election. 

Facebook's efforts also answer people's long-running response to the company's mascot, the thumbs-up "like" button, which was rolled out in 2009. While the "like" feature allows users to express their approval over a post or a photo, some people complained it was too limiting.

"Not every moment is a good moment," said Facebook's co-founder and CEO Mark Zuckerberg in a Q&A session in 2015. He said he realizes people may not want to "like" a current event such as the Syrian refugee crisis or a family member passing away. But at the time, he didn't want users to merely vote up or down on people's posts.

The answer was a set of emojis, which the company released in 2016. The reactions expanded options to a laughing face, an angry face, a "wow," a sad face and a heart. "It's surprisingly complicated to make an interaction that's that simple," Zuckerberg said when announcing the initiative.

Unlike the "like" button or "reactions," the downvote button isn't about giving feedback to commenters but rather to Facebook. The intention is to give users a way to flag inappropriate, uncivil or misleading comments, Facebook said.

It doesn't affect a comment's ranking, and users won't even see how many people downvoted a comment.

Facebook said there are currently no plans to expand the feature.