TikTok says it is tackling a cyber attack that targeted a number of high-profile accounts, including Paris Hilton and CNN.

Our Health Reporter, Daniel Keane, explains why a Russian group of cyber criminals is blamed for an attack which forced major London hospitals to declare a critical incident.

Dr Jonathon McPhetres, assistant professor of biological psychology at Durham University, reveals the science behind goosebumps and why we might be getting them far more often we think.

Also in this episode:

• Research suggests women make fewer mistakes while on their periods
• Asian hornets survive UK winter for first time
• Instagram is testing ‘unskippable' ad breaks and it's making users ‘want to scream’

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