Jul 8, 2017

The extraordinary lives of single cells

Two colonies of different species of pediastrum green algae Photo: Sally Warring / Pondlife

The majority of life on Earth can't be seen with the naked eye. Bacteria, amoeba, archaea found on hydrothermal vents, single-celled algae, and other unicellular organisms outnumber us multicellular types and have existed on the planet at least 2 billion years longer. Some, like the green algae pediastrum shown above, form colonies from identical cells, each self-sufficient despite their communing.

History lesson: Some of these early occupiers of Earth eventually joined together to share the work of life and cooperate to survive — a key step in life's evolution on Earth (and one that could also inform the search for alien life beyond the planet).

Go deeper: Biologist Sally Warring collects samples of unicellular organisms from New York City's ponds and documents the extraordinary lives of single cells at Pondlife.

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Coronavirus updates: Market ends worst week since financial crisis

Data: The Center for Systems Science and Engineering at Johns Hopkins, the CDC, and China's Health Ministry. Note: China numbers are for the mainland only and U.S. numbers include repatriated citizens.

The stock market ended its worst week since the financial crisis, prompting the Fed to release a statement. Meanwhile, the WHO warned that countries are losing their chance to contain the novel coronavirus and raised its global risk assessment to "very high" Friday.

The big picture: COVID-19 has killed more than 2,860 people and infected more than 84,000 others in over 60 countries and territories outside the epicenter in mainland China. The number of new cases reported outside China now exceed those inside the country.

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California coronavirus: Latest case has no recent history of international travel

Gov. Gavin Newsom. Photo: Kevork Djansezian/Getty Images

A new case of the novel coronavirus in California was announced on Friday after Gov. Gavin Newsom said Thursday that 33 people had tested positive for the virus, noting the risk to the public remains low.

What's new: An adult woman with chronic health conditions in Santa Clara County who "did not recently travel overseas" or come into contact with anyone known to be ill was confirmed to have contracted the coronavirus on Friday by CDC and California Department of Public Health officials.

Go deeperArrowUpdated 10 hours ago - Health

Big video game conference delayed amid coronavirus concerns

Photo: GDC

Next month's Game Developers Conference in San Francisco became the latest tech event to be cancelled or postponed amid growing concerns over the spread of the novel coronavirus.

The big picture: A growing number of events are being scrapped, including Mobile World Congress and Facebook's F8 developer conference. Some, like the giant SXSW event in Austin, insist they are moving forward.