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World-renowned human rights activist Saad Eddin Ibrahim, a professor of sociology at the American University of Cairo in Egypt, will lecture at the University of Colorado at Boulder at 5 p.m. on Monday, April 18, in Old Main Chapel. Ibrahim, who was imprisoned for three years before his conviction was overturned by the Egyptian High Court in 2003, will speak on "Spring of Freedom? Is Real Change Coming to the Arab World?" His talk is free and open to the public.

More than 80 engineering student inventions ranging from whimsical Rube Goldberg contraptions to devices that help a person to walk on water will be demonstrated at the University of Colorado at Boulder's ITLL Spring Design Expo on Saturday, April 23. The event, which is free and open to the public from 1 p.m. to 3 p.m., will include exhibits and demonstrations in the Integrated Teaching and Learning Laboratory as well as outside on the Herbst Plaza. The ITL Laboratory is located on Regent Drive just south of Colorado Avenue.

Three University of Colorado at Boulder students have won a prestigious national scholarship for excellence in math, science and engineering. Ashley Moore, Kelsi Singer and Amy Reppert were named Goldwater Scholars and will receive up to $7,500 for educational expenses next year. All three students are juniors who expect to graduate in May 2006.

The annual "Take Back the Night" event to raise awareness of sexual violence issues will be held at 7 p.m. at the University of Colorado at Boulder's Dalton Trumbo Fountain Court on Tuesday, April 19. The event will feature a candlelight vigil and keynote address by Tsunami Rooney of the Safehouse Progressive Alliance for Nonviolence. The event was organized by Ngoc Ma of Sigma Psi Zeta, the Asian sorority on campus.

University of Colorado at Boulder Associate Professor Donna Goldstein has been named winner of the national 2005 Margaret Mead Award, given every other year to a promising young anthropologist for scholarly accomplishments. Awarded jointly by the American Anthropological Association and the Society for Applied Anthropology, or SFAA, the award was given to Goldstein in 2005 in recognition of her recent book, "Laughter Out of Place: Race, Class, Violence and Sexuality in a Rio Shantytown."

Note to Editors: Contents embargoed until 2 p.m. EST April 14. A new analysis of data from more than 4,000 rivers around the world indicates humans are having profound and conflicting effects on the amount of sediment carried by rivers to coastal areas, with consequences for marine life and pollution control, according to a University of Colorado at Boulder environmental scientist.

An Aboriginal tribe's knowledge of the stars, and its culture, stories and music will be explored at the University of Colorado at Boulder's Fiske Planetarium in April. John Stocke, a CU-Boulder professor of astrophysical and planetary sciences, will be joined by Australian storyteller and educator Paul Taylor to present "Aboriginal Skies" on Friday, April 22, at 7:30 p.m., and Saturday, April 23, at 2 p.m.

Editors: Photographers are invited to photograph the mini-language lessons and language materials at the celebration in UMC room 235 from 10:30 a.m. to 2:30 p.m. The Anderson Language Technology Center at the University of Colorado at Boulder is hosting a Gala Celebration of World Languages and Cultures today from 10:30 a.m. to 2:30 p.m. open to anyone interested in learning about other languages and cultures.

The CU-Boulder Alumni Association will honor 13 outstanding members of the campus community during the 75th Annual Alumni Awards Ceremony on Wednesday, May 4. The award recipients will be recognized for their distinguished careers and exceptional contributions to CU and society at 7 p.m. in Old Main Chapel on the Boulder campus. The public is welcome to attend this free event.

U.S. Rep. Mark Udall will be on the University of Colorado at Boulder campus Friday, April 15, to meet with undergraduate students from nine state colleges and universities involved in the Colorado Space Grant Consortium.