On the day he almost died, Kimbal Musk had food on the brain. The Internet startup talent and restaurateur had just arrived in Jackson Hole from a conference where chef Jamie Oliver had spoken about the benefits of healthy eating. This was something Musk thought about a lot- how he might make a difference to the food industry—but beyond expanding his farm-to-table movement along with his restaurant, Musk hadn't yet broken the code. Then he went sailing down a snowy slope (坡) and fell over, breaking his neck. The left side of his body was paralyzed.

Musk eventually made a full recovery, but it involved spending two months on his back, which gave him plenty of time to come up with a plan. Since then, he has launched an initiative to put "learning gardens" in public schools across America; attracted Generation Z to the farming profession by changing shipping containers into high-tech, data-driven, year-round farms; and this year, is kicking off a new campaign to create one million at-home gardens.

Aimed at reaching low- income families, the Million Gardens Movement was inspired by the pandemic, as both a desire to feel more connected to nature and food insecurity have been at the forefront of so many people's lives. "We were getting a lot of inquiries about gardening from people that had never gardened before," says Musk. "People were looking to garden for a bunch of reasons: to supplement their budget, to improve the nutritional quality of their diets, or just to cure the boredom that came with the lockdown. "

The program offers free garden kits that can be grown indoors or outdoors, and will be distributed through schools that Musk's non-profit, Big Green, has already partnered with. It also offers free courses on how to get the garden growing and fresh seeds and materials for the changing growing seasons. "I grew up in the projects when I was young, in what we now call food deserts," says EVE, one of the many celebrities who have teamed up with the organization to encourage people to pick up a free garden. "What I love about this is that it's not difficult. We are all able to grow something. "

Tens of thousands of drone (无人机)owners will have to register their devices for the first time under regulations designed to safeguard privacy.

Rules introduced yesterday require all drones that are fitted with cameras to be logged with the Civil Aviation Authority (CAA). Anyone who fails to do so faces being taken to court and fined up to £1,000. Drones heavier than 250g already have to be registered with the CAA, which costs £9 and must be renewed annually, but the new measures extend this requirement to all devices, including the lightweight models that are used by hobbyist pilots.

The move comes after sharp rise in the number of drones bought by enthusiasts or those operating them for commercial reasons, such as to inspect infrastructure or for photography and filming.

However, the rise has prompted concerns over privacy, with fears that drones are being used to spy on private residences and other buildings. It has also led to an increase in the number of near-misses between drones and other aircraft, including commercial passenger jets. The latest figures show 531 near-misses involving drones were logged in the past decade, including 125 recorded in 2019.

By law drones are supposed to be operated within an operator's line of sight. They have to remain below an altitude of 400ft to avoid interfering with aircraft and flown at least 164ft away from people and buildings. The government has already toughened up regulations in recent years. This includes requiring all operators to pass an online test before being allowed to fly devices. Other changes to the regulations include allowing drones that weigh up to 25kg to be operated, compared with a previous limit of 20kg.

Devices will also fall into three new categories of risk --high, medium and low -- depending on how they will be flown. Low-risk drones, including those typically used by hobbyists, will have operational limitations but will not need authorisation （授权）for flights. Authorisation is needed for larger medium-risk and high-risk drone flights, which are typically carried out in more complex environments, including those beyond the operator's line of sight, which is banned under normal circumstances.

Christian Struwe, the director of public policy, said of the new regulation: "It simplifies different processes and allows customers to travel from country to country without having to worry about different rules in different foreign locations"

It may come as a surprise that human beings are not alone in having invented vaccination （疫 苗）. Work just published in the Journal of Experimental Biology by Gyan Harwood of the University of Illinois confirms that honeybees got there first.

Being social insects, honeybees are at a constant risk of diseases sweeping through their living places-the beehives. Most animals which live in crowded conditions have particularly strong immune systems, so it long puzzled insect experts that honeybees do not.

Part of the answer, discovered in 2015, is that queen bees vaccinate their eggs by passing into them, before they are laid, little bits of proteins from disease-causing virus. These will activate the development of a protective immune response in the developing young. But that observation raises the question of how the queen receives her antigen （抗原）supply in the first place.

To find it out, Gyan Harwood teamed up with a group led by Heli Salmela. Together, they collected about 150 nurse bees and divided them among six queenless mini beehives equipped with groups of baby bees to look after. They fed the nurses on sugar-water, and for three of the beehives they mixed the sugar-water with P. larvae, a virus that causes a deadly disease.

In this case, tostop such an infection happening, Dr. Harwood and Dr. Salmela heat-treated and so killed the virus in advance. And, sure enough, it's confirmed that some bits of P. larvae were getting into royal jelly （蜂王浆） produced by those bees which had been fed with the mixed sugar-water. Moreover, examination of this royal jelly revealed increased levels, compared with royal jelly from bees that had not been fed with P. larvae, of defensin-1, which is thought to help bee immune systems defend the bees from virus infections.

These findings suggest that nurse bees are indeed, via their royal jelly, passing antigens on to the queen for vaccination into her eggs. They also mean, because baby bees, too, receive royal jelly for the first few days after they hatch, that the nurses are vaccinating as well. It seems protective.