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Equal (1): Everything in this space must be equal to 1. The answer is 1-1, placed vertically.
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It had previously been thought that vaccinating children against chickenpox would cause a problematic rise in the linked condition shingles, but a recent long-term study from the US disproved that theory.
Smoke alarms have been around for many decades. The technology has barely changed in recent years – but is modern life slowly outpacing the capabilities of these life-saving devices?