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Trump border czar Tom Homan also had the private sector on the brain, urging attendees to think about contracting out his administration's deportation scheme wherever possible.

Mr Brown sustained "significant head trauma," bleeding on the brain, significant blood loss, internal pelvic and abdominal injuries, multiple rib fractures and a broken leg.

This means that the effect of gaining control of them is likely to be short acting, disassociating and reassociating with each painful signal, limited to the peripheral system, not working on the brain at all — and so highly unlikely to cause addiction or some of the other body-wide effects of opioids.

The effects of speedcubing on the brain and cognitive function are, however, less clear.

While sugar is not classified as a drug in the traditional sense, scientific evidence suggests that its effects on the brain's reward system and dopamine receptors are similar to those of addictive drugs.