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Less than 30% of people in Africa received a dose of the COVID-19 vaccine even 18 months after vaccine development 1 . Here, motivated by the observation that residents of remote, rural areas of Sierra Leone faced severe access difficulties 2 , we conducted an intervention with last-mile delivery of doses and health professionals to the most inaccessible areas, along with community mobilization. A cluster randomized controlled trial in 150 communities showed that this intervention with mobile vaccination teams increased the immunization rate by about 26 percentage points within 48–72 h. Moreover, auxiliary populations visited our community vaccination points, which more than doubled the number of inoculations administered. The additional people vaccinated per intervention site translated to an implementation cost of US $33 per person vaccinated. Transportation to reach remote villages accounted for a large share of total intervention costs. Therefore, bundling multiple maternal and child health interventions in the same visit would further reduce costs per person treated. Current research on vaccine delivery maintains a large focus on individual behavioural issues such as hesitancy. Our study demonstrates that prioritizing mobile services to overcome access difficulties faced by remote populations in developing countries can generate increased returns in terms of uptake of health services 3 . A cluster randomized controlled trial in Sierra Leone shows that targeting access to vaccines in remote areas increases uptake, an approach that can be used to improve vaccine equity in developing countries.

Microcredit has had mixed impacts on measures of women’s empowerment in causal evaluations, making it hard to generalize its effects to different contexts. I attempt to model this variation by testing for within study heterogeneous treatment effects to answer questions about generalizability. I use machine-learning methods to model heterogeneous treatment effects using experimental data from India. I then use this to estimate treatment effects in another context, validating it with actual effects using experimental data from Morocco. I find that there is no heterogeneity in the treatment effect in the case of women’s outcomes in India, making it less of a concern when generalizing to other contexts.

The COVID-19 outbreak had severe adverse impacts on the health and wealth of households in lower-income countries (LICs), and has affected even more severely female-headed households in LICs. Using high-frequency phone surveys in Sierra Leone, we show that female-headed households are likely to rely on cheaper food alternatives (e.g., Cassava) compared to maleheaded households and are more food insecure. These effects are more nuanced among the poorest families owning one or no assets. Furthermore, female-headed households had less access to COVID-19 information, were less likely to adopt preventive measures (e.g., masks and social distancing) at the onset of the pandemic, and show greater signs of vaccine hesitancy in the early stages of the COVID-19 vaccine campaign.

In \"Love by Numbers\" the team answers if analyzing numbers from online dating agencies can improve one's chances in the dating world.

The largest nuclear disaster in more than a decade, the failure of the Fukushima Nuclear Reactors in Japan, 2011 emitted radioactive particles, which severely contaminated the environment, and adversely affected the lives of the locals.

The elections in Delhi were a defining moment - people with ideas and integrity without money or muscle power have proved that anyone can stand and win an election. Look at the US, they have clean air and water, why can't we in India have that too?\"\"Who do you think will be India's next prime minister -

\"\"Some indefinite and long delays without prior warning have affected training programmes, internships, preparation for certain entrance exams and holiday plans.

The Universal Declaration of Human Rights, which India has ratified, grants all human beings the Right to marriage and to start a family.