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The big debate over what a species really is" data-srcset="https://images.newscientist.com/wp-content/uploads/2019/01/23174507/species_190109-fnew.jpg?width=150 150w, https://images.newscientist.com/wp-content/uploads/2019/01/23174507/species_190109-fnew.jpg?width=300 300w, https://images.newscientist.com/wp-content/uploads/2019/01/23174507/species_190109-fnew.jpg?width=768 768w, https://images.newscientist.com/wp-content/uploads/2019/01/23174507/species_190109-fnew.jpg?width=600 600w, https://images.newscientist.com/wp-content/uploads/2019/01/23174507/species_190109-fnew.jpg?width=800 800w, https://images.newscientist.com/wp-content/uploads/2019/01/23174507/species_190109-fnew.jpg?width=1200 1200w" sizes = "(max-width: 600px) 100vw, 600px" class="image lazyload" /></div><div class="card__image-overlay card__image-overlay--bottom opacity"><h2 class="card__heading">Human or hybrid? 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https://images.newscientist.com/wp-content/uploads/2019/01/23101914/00000-00562193.jpg?width=600 600w, https://images.newscientist.com/wp-content/uploads/2019/01/23101914/00000-00562193.jpg?width=800 800w, https://images.newscientist.com/wp-content/uploads/2019/01/23101914/00000-00562193.jpg?width=1200 1200w" sizes = "(max-width: 300px) 100vw, 300px" class="image lazyload" /></div><h2 class="card__heading">Exclusive: 600-million-year old blobs are earliest animals ever found</h2><a href="/article/mg24132142-700-exclusive-600-million-year-old-blobs-are-earliest-animals-ever-found/" class="card__link"></a></div><div class="card__eyebrow card__eyebrow--life"><a href="/subject/life/" class="card__eyebrow-link">Life</a></div></div><div class="card"><div class="card__content card__content--linked"><div class="card__image"><img src="https://images.newscientist.com/wp-content/uploads/2015/08/ns-logo-for-featured-image.jpg" 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class="card__eyebrow-link">Comment</a></div></div></section><section class="section-article-list"><h2 class="section-article-list__title">EDITOR&#039;S CHOICE</h2><div class="card card--list"><div class="card__content card__content--linked"><div class="card__image spancol-1-6"><img src="https://images.newscientist.com/wp-content/uploads/2015/08/ns-logo-for-featured-image.jpg" data-src="https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=300" alt="Exclusive: DNA solves Rudolf Hess doppelgänger conspiracy theory" data-srcset="https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=150 150w, https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=300 300w, https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=768 768w, https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=600 600w, https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=800 800w, https://images.newscientist.com/wp-content/uploads/2019/01/22101232/dnx227.jpg?width=1200 1200w" sizes = "(max-width: 300px) 100vw, 300px" class="image lazyload" /></div><h2 class="card__heading card__heading--s">Exclusive: DNA solves Rudolf Hess doppelgänger conspiracy theory</h2><a href="/article/2191462-exclusive-dna-solves-rudolf-hess-doppelganger-conspiracy-theory/" class="card__link"></a></div><div class="card__eyebrow card__eyebrow--humans"><a href="/subject/humans/" class="card__eyebrow-link">Humans</a></div></div><div class="card card--list"><div class="card__content card__content--linked"><div class="card__image spancol-1-6"><img src="https://images.newscientist.com/wp-content/uploads/2015/08/ns-logo-for-featured-image.jpg" data-src="https://images.newscientist.com/wp-content/uploads/2019/01/14151039/gettyimages-593277048.jpg?width=300" alt="family in flood" 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