Hear that happy business owner.

They're whistling because they found a great deal for unlimited calls, texts and data with three business.

Plans start from just £8 a month with a 4.5% price increase each April.

Switch to three business for savings that'll give you something to whistle about.

Voted the UK's best network for business.

As voted by the Mobile Industry Awards 2024,

£8 per sim for 10 to 20 sims.

24-month plan. Unlimited UK only, X20% fat.

This is an audio long read from nature.

In this episode, hybrid brains, the ethics of transplanting human neurons into animals.

Written by Kendall Powell and read by me, Benjamin Thompson.

In a darkened room in a laboratory in London, a group of students and researchers watch

a clump of human brain cells settle into their new home, a living mouse brain.

On a computer monitor next to a microscope, the human cells light up in flashes of simultaneous

activity. Over time, the cells

sprouts new connections a few centimetres long and form networks with each other. It's captivating

viewing for his students, says Vincenzo de Paola, who runs the lab at Imperial College London.

It's all they want to do. I can't tear them away, he says.

They have front row seats to an unusual show.

De Paola's group is one of just a handful of labs able to study human neural cells at work

in a live developing brain, a system that is otherwise largely off-limits for both

ethical and technical reasons. We cannot study these processes as they unfold in a fetal human brain,

...