#### Herd immunity won’t solve our COVID-19 problem

*Without a vaccine, the cost of reaching herd immunity during a pandemic is counted in lives lost, and it won't quickly stop the virus's spread.*

June 16, 2020 • ~7 min

**Tags:**mathematics health covid-19 coronavirus death pandemic statistics vaccines herd-immunity

#### Coronavirus: Why the maths behind 'COVID alert levels' makes no sense

*The equation 'COVID alert level = R (rate of infection) + number of infections' simply does not add up to a number between one and five.*

May 15, 2020 • ~6 min

**Tags:**mathematics covid-19 coronavirus-2020 lockdown lockdown-exit-strategy

#### How much coronavirus testing is enough? States could learn from retailers as they ramp up

*Testing everyone for COVID-19 isn't realistic in a country the size of the US, but there are ways to design testing systems that can catch most of the cases.*

April 21, 2020 • ~7 min

**Tags:**mathematics health medicine covid-19 coronavirus coronavirus-2020 covid-19-testing pharmacy mathematical-models data-analytics

#### The maths logic that could help test more people for coronavirus

*Here's one way to test more people for coronavirus with fewer resources.*

April 9, 2020 • ~6 min

**Tags:**mathematics coronavirus coronavirus-testing

#### Coronavirus is growing exponentially – here’s what that really means

*The awesome power of exponential growth explained.*

April 3, 2020 • ~7 min

**Tags:**mathematics infectious-diseases covid-19 coronavirus disease-transmission exponential

#### Coronavirus cases are growing exponentially – here's what that means

*Exponential growth, such as in a viral epidemic, starts deceptively slowly, then quickly balloons. A mathematician explains the importance of early action and the costs of delay.*

April 2, 2020 • ~5 min

**Tags:**mathematics coronavirus coronavirus-2020 viruses quick-reads outbreaks exponential

#### Lack of testing doesn't explain why Japan has so far escaped the worst of the coronavirus

*You don't have to believe the official figures to realise that the rate of spread of the virus in Japan has been slower than in other countries.*

March 26, 2020 • ~5 min

**Tags:**mathematics covid-19 new-coronavirus japan

#### 7 lessons from 'Hidden Figures' NASA mathematician Katherine Johnson's life and career

*NASA scientist Katherine Johnson was instrumental in getting people to the moon. Here are some of the lessons one mathematics professor believes she taught us all.*

Feb. 26, 2020 • ~7 min

**Tags:**mathematics space feminism nasa science space-shuttle apollo-11 moon-landing race racism civil-rights segregation scientist hidden-figures katherine-johnson

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