In hyposensitization therapy, the immune system is regularly exposed to an allergen so that it can build up a tolerance to it.
Out of nowhere, a random odor can send you hurtling back to a childhood memory, and you won't know why. Smell is one of our most powerful senses, and it's powerfully under-researched.
Thousands of people in Germany have vouched for refugees in recent years and are now being asked to pay high sums. Were their good intentions misguided?
Even a reliable workhorse like Russia's Soyuz rocket has bad days. Some missions go horribly wrong. So while the basics of rocket science are the same as ever, there are always new contenders to shake things up.
The German auto giant's board has approved plans to spend €44 billion over the next five years to overhaul its plants for electric vehicle production. DW explores where the money will be spent.
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