Arcturus Publishing, it's 202 pages (ebook edition) and available in paperback and ebook formats. It's worth noting that the ebook format has a handy interactive table of contents as well as interactive links. I've really become enamored of ebooks with interactive formats lately.
This is a beautifully illustrated book which includes biographies for titans of science and exploration (Stephen Hawking, Albert Einstein, Marie Curie, Galileo) to scientists who are equally worthy but lesser known by the general public outside their spheres of influence (Valentina Tereshkova, John Forbes Nash, Katherine Johnson, Mary Anning). The subjects of the biographies often lived very challenging lives and suffered a great deal because of their ethnicity, sex, or mental/physical handicaps. The biographies are roughly 10-15 pages each and run to a fair bit of age appropriate detail. Each of the them includes several colour illustrations.
I've been banging on about the importance of STE(A)M education for decades and this would make a superlative addition to the classroom or school library, or gift for a young person.
The book also includes a short glossary, but no index. Five stars for plucking out a wide variety of 'lesser known' science and maths legends from varied backgrounds and time periods.
Disclosure: I received an ARC at no cost from the author/publisher for review purposes.