Personal safety is more than just avoiding dark streets at night. Having one of these gadgets at hand will help keep you out of harm’s way.

Heart Trinket Alarm

$9.99, from www. safe-girl. co. uk

It appears to be a shiny heart. However, inside the shell lies an alarm. If you feel threatened, pull the chain and instantly draw attention thanks to the warning sounds it sends out. Hang it from a bag, or use it as a key ring so it’s close to hand. Powered by two LR44 batteries, it has an “on-off” switch. Moreover, it’s not ugly, so fashion-conscious teens will be happy to use it.

Swam OM-DOORST Doorstop Intruder Alarm

$3.99, from www. maplin. co. uk

If you feel nervous about staying at home alone or arriving at a hotel and are concerned about safety, this device can help. Put the doorstop as close as possible to the closed internal door. Then if someone tries to force his way into the room, the door will push against the gadget and it will sound an alarm. It requires a DC 9V battery that isn’t included.

Walking Stick With Built-in Alarm & Light

$24.99, from www. betterlife. co. uk

This walking stick is height-adjustable and it’s foldable (可折叠的). In addition to aiding you in walking, it comes with several extras. For example, you’ll find a flashlight at the front of the stick — great if it’s dark and you want to see clearly. There’s also an alarm function — just press the button on the side if you want to draw attention.

WD My Passport Ultra

$49.99, from www. westerndigital. com

This device will help keep your documents safe. You can easily set passwords so others can’t access it. Even if it ends up in the wrong hands, they won’t be able to view what’s in the device. You can also back up your files. It transfers files quickly due to the USB3.0 port and is available with 1-3TB capacity (容量).

Meat cultivated (培植) from cells—with no need to raise and kill animals—is now a reality. The process of cultivating meat uses the basic elements needed to build muscle and fat and enables the same biological process that happens inside an animal. Cultivated meat is identical to conventional meat at the cellular level. But can it be made cheaply enough to replace animal agriculture?

More than 150 startups are pursuing an ambitious goal: meat that doesn’t require raising and killing animals and that is affordable and tastes and feels like the meat we eat now. They are part of a young industry aiming to use cell biology to reduce the environmental impact of the world’s ever-increasing demand for meat and change global protein production the way electric cars are shaking up the auto industry.

“We are addicted to meat as a species. It’s part of our culture,” said Believer founder Yaakov Nahmias. But “we thought about quantity rather than the environment, rather than sustainability.”

Although there are dozens of companies making this meat, none have yet reached commercial-level production in terms of scale or cost. From cell line development to bio-processor design, there are a number of scientific challenges to meet before cultivated meat is widely available at the market. Government policy is another challenge. Only Singapore and the U. S. allow sales of cultivated meat.

And while many people who have tried it say they like it, others find the idea distasteful. A recent survey from The Associated Press-NORC Center for Public Affairs Research found that half of U. S. adults would be unlikely to try it. When they were asked why, about half said they didn’t think it would be safe. Even Nahmias’10-year-old son Oren said he would only eat traditional meat. “I feel bad” for the animals, he said, “but they are yummy!”

“Until this meat costs and tastes the same as traditional meat, it will remain a specialized product,” said Bruce Friedrich, president of the Good Food Institute.

Hussam Al-Attar, a 15-year-old boy in Gaza, is able to build a device to provide electricity for the lamps of the tent he is staying in with his family.

Al-Attar got two fans at a resale market and used them to create small wind turbines (涡轮) to produce electricity. His invention led others in the camp where he stayed to start calling him the “Newton of Gaza”. That comparison involves the English scientist, Isaac Newton. Newton is known for his major scientific discoveries in the fields of physics, mathematics and astronomy more than 300 years ago. A famous story about Newton describes how an apple falling on his head led him to discover the nature of gravity.

Al-Attar and his family are staying in a tent that is partly attached to a house. He was able to climb onto the roof to set up two fans, one above the other. The wind could turn the fans, which produced small amounts of electricity. He then connected the fans to wires and built a charging station. Al-Attar also built switches to control a lighting system made out of wood.

Al-Attar’s first two attempts failed, and it took him a lot of time to develop a working system. He started developing it further, bit by bit, until he was able to extend the wires through the room to the tent, so that the tent would have light. He was happy to be able to create something to help ease “the suffering” of his family members. Now, he is just looking forward to the future when conditions can improve in Gaza.

“I am very happy that people in this camp call me the ‘Newton of Gaza’,” Al-Attar said. “Because I hope to achieve my dream of becoming a scientist like Newton and creating an invention that will benefit not only the people of the Gaza Strip, but the whole world.”