Dianna Leilani Cowern (born May 4, 1989) is an American science communicator. She is a YouTuber; she uploads videos to her YouTube channel Physics Girl explaining various physical phenomena. She worked in partnership with the PBS Digital Studios from 2015 until 2020, when she discontinued her partnership.[5] She has collaborations with other YouTube personalities, including fellow science communicator Derek Muller of the channel Veritasium, makerSimone Giertz, and mathematics animator Grant Sanderson of 3Blue1Brown.
She developed long COVID after July 2022, which has limited her ability to create new YouTube videos.[6]
She started her channel Physics Girl on October 21, 2011.[12] In an interview with Grant Sanderson, she said that some of the earlier videos were later deleted from the channel.[9]
Cowern has also participated in various events as a speaker. In 2015, she participated in a conference organized by the U.S. News & World Report.[13]
In February 2017, she gave a talk at Google titled "Becoming YouTube's Physics Girl".[14] In 2018, she gave a keynote at CAST 2018 and at STEMtastic.[15][16][17]
On September 25, 2020, Cowern announced on her YouTube channel that she would be ending her five-year partnership with PBS Studios.[21] Her personal YouTube channel however, has gone on, and by mid 2023 she has over 221 million views and over 2.74 million subscribers on the platform.[12] On TikTok, in March 2023, she has over 2.8 million likes and over 176,000 followers.[22]
On June 23, 2022, she announced she would be producing a science-based talk show for Curiosity Stream's Originals called Proof of Concept.[23] The show started streaming in August 2022.[24]
A Physics Girl Patreon was established in November 2019.[27]
In May 2022, Cowern announced that she had recently married.[28]
In July 2022, Cowern reported that she had developed long COVID. She was hospitalized in March 2023, as her symptoms similar to myalgic encephalomyelitis/chronic fatigue syndrome continued to worsen, leaving her unable to move.[29][30][6][31][32] As consistent with the condition, any improvement has been slow.[33][34][35] However, on November 20th 2024, Cowern made an update to her channel indicating that while she "still can't get out of bed," she had been improving in her ability to perform certain activities and, "getting back [her] brain."[36]
^Cowern, Dianna. "Instagram post dated Nov. 10 2022". Instagram. Retrieved March 4, 2023. Since July, I've been struggling with what's called "Long COVID." [...] mine is very similar to Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).
^"Dianna shows us her PICC line". Physics Girl. June 28, 2023. Retrieved July 9, 2023 – via YouTube. Health update - Dianna now has a PICC line inserted into her arm. The PICC is used to help Dianna receive IV medications and fluids without having an adverse reaction to them. The PICC is threaded up the arm through a large blood vessel that extends into the chest.