Ringworld's Children

infobox Book
name = Ringworld's Children
title_orig =
translator =


image_caption = Cover of first edition (paperback)
author = Larry Niven
illustrator =
cover_artist =
country = United States
language = English
series = Ringworld
genre = Science fiction novel
publisher = Tor Books
release_date = 2004
english_release_date =
media_type = Print (Hardcover & Paperback)
pages = 288 pp
isbn = ISBN 0-765-30167-9
preceded_by = The Ringworld Throne, (1996)
followed_by =

"Ringworld's Children" is a 2004 science fiction novel by Larry Niven, the fourth in the "Ringworld" series set in the Known Space universe. It describes the continuing adventures of Louis Wu and companions on Ringworld.

Plot summary

The novel's plot is largely concerned with the so-called "Fringe War". All the intelligent species of Known Space are interested in the Ringworld. In the novel (actually begun in the previous novel, "The Ringworld Throne"), they engage in a Cold War of sorts on the fringe of the Ringworld star system.

The novel also explores the interactions of multiple elements invented or described in previous Niven short stories or novels. For instance, two stories in the "Crashlander" short-story anthology consider separately the implications of a super-fast hyperdrive ("At The Core") and medical nanotechnology ("Procrustes"). Although these super-technologies are seemingly unrelated, their combination is a key element of the plotline of "Ringworld's Children".

In another example, the ARM ships of the Fringe War (the ARM was detailed in "The Long ARM of Gil Hamilton") are powered by anti-matter and have anti-matter weapons. When asked where they most likely got it from, the Hindmost remarks that it is probably from an anti-matter solar system. This is a reference to a third short story ("Flatlander") in the "Crashlander" anthology that describes the discovery of the antimatter planet Cannonball Express.

Another, more obscure reference to a Beowulf Shaeffer story, "The Borderland of Sol", regards creatures that live in Hyperspace and eat spaceships in Hyperspace around gravity wells, thus explaining why ships cannot safely engage their hyperdrive close to a large mass (which was previously described as a singularity before this revelation). This reference, dismissed as a myth in the earlier story, is casually confirmed as fact in this installment and is surpassed by the creation of a hyperdrive that moves the entire Ringworld to destination unknown.

As in the previous two novels, the interactions of various hominid Pak protectors play an important role, including one who claims to be one of the original builders of the ring. A number of previously revealed "facts" turn out to have been lies told by characters in the books, which is another common feature of Niven's Ringworld and other Known Space stories, especially those involving Protectors and Puppeteers.