Boeing: why the Ukraine crisis could help it become the world’s number one aircraft maker again

Both Boeing and Airbus have taken a hit in the stock market since Russia’s invasion of Ukraine on February 24, because of the prospect of decreased demand for aircraft in affected markets and potential disruption to financing arrangements.

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How does the immune system mobilize in response to a COVID-19 infection or a vaccine?

Heading into the third year of the COVID-19 pandemic, many of us have become amateur immunologists, having conversations at the dinner table and in the grocery store aisle about mRNA vaccines, variants, breakthrough infections, “waning” immunity, herd immunity, endemic viruses, booster shots and much more.

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