Satellite navigation has revolutionized how humans find their way. However, these systems often struggle in urban areas, where buildings can interfere with weak satellite signals. To counter this, a team has developed an alternative, satellite-free system, which could improve applications that require precise positioning in cities, such as self-driving cars.

Research Article: Koelemeij et al.

News and Views: Phone signals can help you find your way in cities even without GPS

How deforestation is the biggest threat to a rare lemur’s existence, and ultraviolet-activated molecules can kick-start plastic polymerization.

Research Highlight: This rare primate will not survive deforestation

Research Highlight: Lights, chemical reaction! Plastics take shape with help from UV light

We discuss some highlights from the Nature Briefing. This time, a survey reveals the challenges facing international postgraduate students, and the key takeaways from COP27.

Nature Careers: Obstacle race: the barriers facing graduates who study abroad

Nature News: COP27 climate talks: what succeeded, what failed and what’s next

New York Times: U.N. Climate Talks End With a Deal to Pay Poor Nations for Damage

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