Systems Science

All living things need air to survive. Air also protects Earth. Discover why air is an important part of nature!

Plants and animals from millions of years ago left behind fossils. Fossils can teach people about the past. They are also used for fuel. Discover why fossils are an important part of nature!

Soil covers most of the land on Earth. It feeds plants and is home to many animals. Discover why soil is an important part of nature!

Most of Earth is covered in water. Water falls from the sky as rain or snow. All living things need water to survive. Discover why water is an important part of nature!

Flushed with victory after our first Elite Eight round, my team of beautiful women and I are the talk of the System. Now that my warlord powers are coming into their own, we seem to be unstoppable. There’s even talks about expanding our team, and the addition of a curvy goth girl makes things *very* interesting.

There is an unaddressed Black mental health crisis in our world today. In The Unapologetic Guide to Black Mental Health, psychologist Reeda Walker offers a comprehensive guide to help African Americans combat stigma, increase awareness around mental illness, practice emotional wellness, and get the best care possible for Black people in an unequal system.

Across every era of human history, one star has commanded the gaze with unmatched brilliance: Sirius. Visible from nearly every inhabited corner of the Earth, it has guided travelers, inspired mythmakers, and puzzled astronomers. But beyond its brightness lies a far deeper story—of science and symbolism, of stellar evolution and ancient memory, of cosmic scale and human meaning.

Step into the golden age of speculative imagination with Classic Science Fiction: Selected Short Stories, a masterfully curated collection from some of the most influential voices in science fiction history. This volume brings together visionary tales by Philip K. Dick, Murray Leinster, William Tenn, Robert Sheckley, Lynn Venable, E. E. Smith, and Fredric Brown—authors who shaped the genre with bold ideas, sharp wit, and unforgettable concepts.

2095. Dans un monde anesthésié par les épidémies, les femmes, devenues rares et donc précieuses, gouvernent désormais l'ensemble des cités survivantes. Le système a été entièrement réinventé : qu'il s'agisse de votre catégorie sociale, de votre mariage, ou même de votre prénom, tout est imposé.

Jake's monster girls just want to have fun, but success always brings new challenges. After his embarrassment in the Trials, an evil god wants vengeance, and he'll stop at nothing to get it. Despite his sound defeat, Apophis's plot is going to make it difficult for Jake's party to enjoy their hard-won freedom. Meanwhile, the true perils of the war with Tartarus loom on the horizon. Join Jake and his growing family as they face fresh challenges and summon a new ally that's a lot more than they can handle. The giant dark elf lamia proves to be as difficult to deal with as she is powerful.

As Reeves shows, the growing separation between the upper middle class and everyone else can be seen in family structure, neighborhoods, attitudes, and lifestyle. Those at the top of the income ladder are becoming more effective at passing on their status to their children, reducing overall social mobility. The result is not just an economic divide but a fracturing of American society along class lines. Upper-middle-class children become upper-middle-class adults.

Kids love asking big questions about space: How hot is the Sun? What are planets made of? What do astronauts see in space? Their questions won’t stop there — and they don’t have to. Our Solar System for Kids 8–12 turns every “why” and “how” into a moment of discovery. Your child will feel like a brave explorer as they learn real science through storytelling.

Build Profitable AI-Powered Products, Services, and Automations—Without the Overwhelm If you’ve been curious about using AI to start or grow your business but feel lost in the sea of tools, tech jargon, and hype, you’re not alone. The truth is, you don’t need coding skills, expensive consultants, or months of trial and error to create something that sells. The ChatGPT-5 Business Blueprint is your step-by-step guide to turning AI into your most reliable business partner—whether you want a $1,000-a-month side hustle or a $10K+ scalable venture.

Never compromise a principle! Stand for the right! For Charles, adventuring was a game -- exciting, fun, and glamorous -- until the stakes rose to epic proportions, threatening the lives and freedom of everyone in the entire system of planets. Now, he must lead a motley crew to save the system from a past he never knew and an ancient war that has continued on in the shadows.

In this book, Katrina Hazzard-Donald explores African Americans' experience and practice of the herbal, healing folk belief tradition known as Hoodoo. Working against conventional scholarship, Hazzard-Donald argues that Hoodoo emerged first in three distinct regions she calls "regional Hoodoo clusters" and that after the turn of the 19th century, Hoodoo took on a national rather than regional profile.

To gain his Master Class, John Lee made a deal with the Erethran Empire. Now, the empire has come to collect on the debt, forcing him to appear in their capital after his last fight. Thrown into Galactic politics of a militarized, system-based society, John will have to weigh consequences of the decisions he's been asked to make and confront the warped reality of a system-created empire. When politics, self-interest, and a human's stubbornness collide, the very stars are threatened.

Finding his way back to Earth through a portal, John returns to a very changed world. The shackles of galactic control have bound Earth and humanity ever tighter to the system. Now, John has to find a way to free Earth from galactic control while battling stronger, more powerful enemies. And worst of all, he will need to indulge in politics. Good thing he's got a new class and new allies.

The Nothing is a haunting science fiction short story by legendary author Frank Herbert that explores humanity’s confrontation with the unknowable. When scientists encounter a mysterious force known only as “the Nothing,” they discover a phenomenon that defies measurement, language, and reason itself. As attempts to understand and contain it fail, the true horror emerges—not destruction, but the collapse of meaning, certainty, and identity.

Living busily on Planet Earth, we rarely remember that we actually inhabit only a miniscule part of the universe. In The Planets and the Solar System, Jen Green paints the wider picture, and takes us on a journey across billions of kilometers in our galaxy, from our Sun to near and distant planets. Some, like Mercury, have a molten core surrounded with crust and spins quickly; Jupiter, on the other hand, is a big ball of gas.

The Devil in Iron by Robert E. Howard is a thrilling sword-and-sorcery adventure set in the legendary Hyborian Age, starring the iconic warrior Conan the Barbarian. When an ancient iron-skinned god named Khosatral Khel is awakened on the mysterious island of Xapur, a resurrected city of forgotten magic rises from the jungle. Drawn into a deadly trap involving the captive noblewoman Octavia and the scheming Jehungir Agha, Conan must battle sorcery, monstrous guardians, and the living iron god himself.