Over the years, paleontologists have been able to uncover many mysteries about human ancestors from unearthed skeletal remains. However, not much is known about their development and growth. because most hominin fossils are those of adults, and remains of developmentally young hominins are uncommon. Now, a perfectly-preserved partial skeleton of a Homo Naledi juvenile, who lived on Earth between 335,000 and 226,000 years ago, is providing insights into how our ancient relatives may have aged.