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Cuban scientists are advancing research on a nasal vaccine against COVID-19, Eduardo Martinez, president of the state-owned biotechnology and pharmaceutical industries group BioCubaFarma, said Thursday.

"The cumulative impact of widespread burning is catastrophic, as fire recurrence may lead to the impoverishment of ecosystems and the disruption of their functioning," scientists recalled.

On Dec. 8, Russia resumed space tourism with the dispatch of Japanese billionaire Yusaku Maezawa and his assistant Yozo Hirano to the International Space Station.

South African president Sunday said the Omicron variant is a wake-up call to vaccine inequality, calling for accessibility of COVID-19 vaccines to reduce risks of infections.

All variants of COVID-19, including the Delta variant that is currently dominant worldwide, can cause severe disease or death, in particular for the most vulnerable people, and thus prevention is always key.

The Double Asteroid Redirection Test (DART) will be the first demonstration of the 'kinetic impactor' technique in which a spacecraft deliberately collides with an asteroid at high speed.

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