A health worker holds a vial of the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, at the Munsieville Care for the Aged Centre outside Johannesburg, South Africa May 17, 2021.

Single dose of Pfizer, AstraZeneca Covid vaccine offers 60% protection for the elderly: Lancet study

Froth and foam floating at Sellur tank in Madurai | File
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Not sedate: Huge solar flares and coronal mass ejections spew material from the solar surface into outer space
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In this file photo taken on April 22, 2016 a child remains at an area affected by a drought on Earth Day in the southern outskirts of Tegucigalpa, Honduras.
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The Euphlyctis Kerala species of frog discovered from near the Thattekkad bird sanctuary.
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Device providing super-hearing. The spherical array has 6 microphones sensitive to ultrasound. The ultrasounds are played back to the headphones so that the listener can detect the direction of their source correctly.Credit: Ville Pulkki/Aalto University
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In this Friday, March 9, 2012 photo, an aurora borealis swirls in the sky over the Yukon River village of Ruby, Alaska
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