For The Mathematically Curious About:
Art & Architecture
Astronomy & the Cosmos
Education Gr. K-6
Education Gr. 7+
History: Math & Science
Mathematical Hands On Projects
Mathematical Posters
Mathematical Principles
Mathematical Thinking
Mathematical Toys
Practical Applications
Puzzles and Games
Science (Math) Fiction
Time & Time Travel
Customer Service
About Us



About Time: Einstein's Unfinished Revolution
by P.C.W. Davies
For the serious student to the professor. Ever since Einstein overthrew the Newtonian concept of time as a rigid entity, flowing past us in constant, measurable units, physicists like Davies have molded the fantastic, warpable space time into speculative theories about the origin, direction, and end of time. Davies has written a dozen general-interest works, including the delightfully grim The Last Three Minutes. With his customary clarity, Davies delineates the questions left open by Einstein's theories and the controversial "cosmological constant" that make his (Einstein's) equations work.


Brief History of Time
by Stephen Hawking
First published in 1988, with over 9,000,000 copies in print, it was a landmark volume in science writing. The original edition was on the cutting edge of what was then known about the origins and nature of the universe. In the ensuing years, extraordinary advances in the technology for observing both the micro- and macrocosmic world have confirmed many of Hawking's theoretical predictions.


Calendrical Calculations: The Millenium Edition
by Edward M. Reingold, Nachum Dershowitz
This new edition of the successful calendars book is being published at the turn of the millennium and expands the treatment of the previous edition to new calendars and variants. As interest grows in the impact of seemingly arbitrary calendrical systems upon our daily lives, this book frames the world in a completely algorithmic form. The book gives a description of twenty-five calendars and how they relate to one another: the Gregorian (current civil), ISO (International Organization for Standardization), Egyptian (and nearly identical Armenian), Julian (old civil), Coptic, Ethiopic, Islamic (Moslem), modern Persian (both astronomical and arithmetic forms), Baha'i (both present and future forms), Hebrew (Jewish), Mayan (long count, haab, and tzolkin), Balinese Pawukon, French Revolutionary (both astronomical and arithmetic forms), Chinese (and nearly identical Japanese), old Hindu (solar and lunisolar), and modern Hindu (solar and lunisolar). Easy conversion among these calendars is a by-product of the approach, as is the determination of secular and religious holidays. Calendrical Calculations makes accurate calendrical algorithms readily available for computer use with LISP, Mathematica, and Java code for all the algorithms included on the CD, and updates are available on the Web. This book will be a valuable resource for working programmers as well as a fount of useful algorithmic tools for computer scientists. In addition, the lay reader will find the historical setting and general calendar descriptions of great interest.


The Children's Mathematics Calendar 2003
by Theoni Pappas
Back by popular demand. No kidding! Ms. Pappas skipped 2002 and was deluged by disappointed customers. So here it is! A short problem for every day of the year plus an extra monthly bonus problem. It is well within the province of grammar school students grade 4 and up and up. Many adults have felt challenged as well since their arithmetic skills have gotten a bit rusty. It's a great calendar for the whole family to share.


Faster: The Acceleration of Just About Everything
by James Gleick
This book is about the modern culture of speeding up to save milliseconds. The author finds so many interesting aspects of this "age of acceleration" that we are now living in. He wastes no time in describing the many facets of this new lifestyle and the possible ramifications of what he calls "hurry sickness". Why are we in such a rush?? Are we really saving time? And just what do we do with those few seconds we seem to save by multitasking even the smallest of our daily activities?
The book answers many of those questions and it also looks into other scientific aspects of time and how we perceive it. I highly recommend this book for those who feel rushed in their lives but don't know why. I also recommend it for anyone interested in the science of time and time travel.


Marking Time: The Epic Quest to Invent the Perfect Calendar
by Duncan Steel
This book is a history of the Western calendar, a chronological system that is sort of logical but strangely flawed all the same. The author examines the attempts to give the calendar a basis in astronomical fact. He plucks countless fascinating oddments from the historical record. and doesnąt shy away from advancing controversial ideas, one being that the meridian time of Washington, D.C. may be a more useful world standard than that of Greenwich, England, and not merely for political reasons. Neither is he afraid to use sometimes difficult mathematics to prove his points, giving his book a depth that many other popular studies of the calendar lack.


The Mathematics Calendar 2004
by Theoni Pappas
Back by popular demand. No kidding! Ms. Pappas skipped 2002 and was deluged by disappointed customers. So here it is! A short problem for every day of the year plus a bonus monthly-page of mathematics history, or a special problem. Suitable and challenging for the mathematically inclined from grade 11 and up and up and up!


Time Travel in Einstein's Universe: The Physical Possibilities of Travel Through Time
by J. Richard Gott
"As one of the foremost scientists in the field of time travel, Princeton astrophysicist Gott takes it upon himself to disseminate advice on building time machines. The construction of the vessel itself is rarely of concern here; it is the way it is used and the way that space-time (the dimensions of space and time that we collectively consider to be our universe) behaves around it that may eventually allow adventurers to break with the usual order of things. Believing that science fiction often spurs true scientific discovery, Gott explores numerous theatrical and literary concepts before moving on to current bona fide theories, pointing out the difficulties of each method. Einstein's theory of relativity, upon which all of the presented theories depend, is described in impressively clear language. Gott clearly enjoys his subject and his excitement and humor are contagious. Liberally sprinkled diagrams will help readers who find this stunning array of craziness a lot to take in."