2021-07-16

封面图展示的是1只7周大的斑点鬣狗幼崽，它生活在肯尼亚马赛马拉国家自然保护区，在妈妈的注视下，它探索着巢穴周围的区域。虽然这只幼崽还披着出生时的皮毛，但它已经开始了解母亲与哪个部族成员关系最密切。这个长达数月的学习过程很可能是年轻鬣狗“继承”它们母亲社会网络的一种机制。

A 7-week-old spotted hyena cub explores the area around its den in Masai Mara National Reserve, Kenya, while its mother looks on. The cub, still in its natal coat of fur, has already started to learn which clanmates its mother associates with most closely. This months-long learning process is most likely the mechanism by which young hyenas "inherit" their mothers' social networks.

2021-07-23

封面图为我们展示了1颗行星的内部结构，其地质历史的重要线索就包含在其中。在火星上的2年时间里，“洞察号”着陆器通过记录地震数据了解火星的内部结构。数据显示，火星有分层的地壳，有厚厚的岩石圈地幔，以及一个富含轻元素的液态铁镍核，这些都表明火星的形成和演化与地球截然不同。

Vital clues to a planet's geologic history are contained in its interior. For 2 years on Mars, the InSight lander has recorded seismic data to constrain the planet's interior structure. The data reveal a layered crust, a mantle with a thick lithosphere, and a liquid iron-nickel core enriched in light elements, suggesting that Mars formed and evolved differently from Earth.

2021-07-30

在发现胰岛素100年后，1型糖尿病仍然是一种需要终生每日管理的慢性疾病。这包括监测食物摄入量，通过手指点刺测量血糖，以及通过针头注射或者是近期才推出的胰岛素泵和连续循环设备注射胰岛素。科学家利用细胞疗法改善治疗，并且用预防策略推迟症状的出现等手段，应该可以加强今后对该疾病的治疗管理。

A hundred years after the discovery of insulin, type 1 diabetes remains a chronic disease that requires lifelong daily management. This includes monitoring food intake, measuring blood glucose via finger pricks, and administering insulin shots through needles or, more recently, insulin pumps and continuous-loop devices. Improving treatment with cell therapies and delaying symptom onset with prevention strategies should enhance the future management of the disease.

2021-08-06

封面图展示的是1只自由放养的狐松鼠从一个平台跳跃到另一个平台。为了发展它们强健的跨越间隙技能，松鼠必须学会快速预估跳跃的距离和着陆结构的稳定性。这种认知评估与先天身体活动能力的结合可能在脊椎动物的运动中发挥关键作用。

A free-ranging fox squirrel leaps from one platform to another. To develop their robust gap-crossing skills, squirrels must learn to rapidly estimate jump distance and landing structure stability. Such combinations of cognitive evaluation and innate physical abilities may play a key role in vertebrate movement.