After building some standard cargo bikes,【小题1】, this time with something very special. I wanted to build an ideal cargo bike combining the stability of a three-wheeler with the possibility to change directions like being on two wheels.

The first step was to do extensive research.【小题2】. An incredible source of technical inspiration was the online Tilting Group. Although primarily concerned with tilting concepts of engine driven constructions, the group is surely the best place to find information about constructing a tilter.

After researching and outlining a few ideas, I grabbed some parts and started with a very simple prototype. Building such a vehicle needs a high degree of accuracy, which was not the case with my prolotype. 【小题3】. So I made a few more sketches, which led to an improved version of the driving and tilting mechanism.

Then I started building the tricycle. Building the structure was quite straightforward. As usual I took an old bike apart for the back triangle and then added the front part. After adding a cargo basket to the structure, 【小题4】.

Now came the hard part the driving mechanism. I started with the usual design used for two-wheel cargo bikes, but it took me quite some time to figure out how to pass the driving force to both wheels without allowing the whole thing to lock itself in any angle.

【小题5】, but I’m sure I can use the knowledge I gained one way or another.

If businesses are to get workers back into the office, finding ways to keep social distancing(社会隔离)will be important. An Israeli company thinks it can help, using smart sensors installed on workplace ceilings.

PointGrab developed its technology before COVID-19 to help workspace managers optimize(优化)how employees use office space. About the size of a smoke alarm, the sensors can record the exact number and location of people in buildings including offices, hotels and restaurants. One of the company's first clients was Deloitte, which installed the system at its London office last year. PointGrab s sensors were connected to screens in the building to show the availability（利用率)of desks and shared areas in real time. PointGrab CEO Doron Shachar says it was one of a series of innovations that helped Deloitte fit 30% more people into 3% less space.

Now to prevent the coronavirus spreading face to face, PointGrab has adapted the technology to some degree so the sensors can also monitor social distancing by keeping track of how far apart people are, and whether they're traveling in one direction around a building. Workspace managers can set up alarm for when two people are closer than two meters for more than 30 seconds, for example. The sensors have been included in the “six feet office” concept created by a company Cushman & Wakefield to encourage employees to practice social distancing. They are currently being used in this way at a university in the Netherlands, and at an innovation centre in Belgium. While the social distancing innovation is new, PointGrab has installed more than 10, 000 sensors for workspace optimization, including in the offices of Coca-Cola, Facebook and Dell.

Workers might not like the idea of being monitored, but PointGrab says no images or identifying features are recorded. Instead, each employee is represented as a dot on a screen. “The sensor does not violate people’s privacy,” Shachar says. This is extremely important in the workspace.

Baidu has uncovered plans for an electric self-driving car with a removable steering wheel (方向盘), marking another step forward in the fast-moving robotaxi race in China.

The Chinese tech giant, the country’s answer to Google, showed the Apollo RT6, its sixth-generation self-driving car, at its yearly flagship meeting on Thursday. Baidu’s ride-hailing (叫车) service, Apollo Go, currently operates in 10 Chinese cities. The new vehicle will be introduced through that program sometime next year. Once regulators give the green light, the Apollo RT6’s removable steering wheel will legally be able to come off, a company executive said Thursday.

Baidu is selling its new design as a way to free up space for things like “extra seating, vending machines, desktops, or gaming consoles”. The company said its new self-driving car has dramatically lowered the production costs from previous versions, by about half. Those cost savings will be passed on to passengers as the company prepares to introduce the cars to its existing robotaxis around the country, according to CEO Robin Li.

“We are moving towards a future where taking a robotaxi will be half the cost of taking a taxi today,” he said in a statement. “This massive cost reduction will make tens of thousands of self-driving cars available across China.”

Baidu made its name as a massive search engine provider, but it has also long spent money on self-driving technology in the world’s largest car market. In April, the company announced — along with another Chinese self-driving startup — that it would start letting people in certain areas book taxi rides without anyone behind the wheel. Other companies have showed off vehicles without steering wheels before, including GM and Honda, Google, and Mercedes-Benz.

In April, Tesla CEO Elon Musk told analysts that the automaker was aiming to start mass production of its own robotaxi without steering wheels or pedals in 2024. Baidu said Thursday that its new model was ready for production, but did not disclose a manufacturing partner.