There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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There's a café in France which charges €7 for a coffee to rude customers and €1.40 to people who talk politely to staff.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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