The Bum as Con Artist: An Undercover Account of the Great Depression
Middle-class observers reacted to hoboes and tramps of the Great Depression with an array of responses, viewing them with suspicion, empathy, concern, fear, sometimes even a twinge of envy. For some, stolidly holding onto traditional values of work and success, the "bum" was suspect, potentially a con artist. Tom Kromer's "Pity the Poor Panhandler: $2 An Hour Is All He Gets" exemplified this stance, urging readers to resist the appeals of panhandlers and refer them to relief agencies, where prof
Slumming Among the Unemployed: William Wycoff Studies Joblessness in the 1890s
Even before the 1890s depression struck with devastating force in 1893, large numbers of jobless men and women competed in tight labor markets and faced homelessness. One of the best first-hand descriptions of "what it is to look for work and fail to find it" comes from political economist Walter Wycoff's two-volume study of The Workers: An Experiment in Reality, first published in 1899. Wycoff had abandoned his studies at Princeton to seek a more concrete appreciation of social problems. His re
This field exercise determines the susceptibility of different rocks to weathering, and, using the dates on the tombstones, estimates some weathering rates. Placing the field lab in context for use, this site describes the learning goals, teaching notes and materials, assessment recommendations, and provides links to other resources and references.
GP-B Educator's Guide
This 52-page booklet provides an overview of the history, science and technology of this mission, including an introduction to Einstein's theory of curved spacetime. The guide also contains 18 pages of hands-on classroom activities related to gyroscopes, curved spacetime, frame-dragging and other concepts related to the GP-B experiment.
This site contains a brief description of the separation mechanism in size exclusion chromatography. The picture helps visualize the separation, but is a simplified and idealized presentation. A companion site, http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/AffinityChrom.html, describes affinity chromatography. The two sites together may be helpful in a biochemistry course where such techniques are used or discussed.
Adsorption and Chromatography in Bioseparations
This material was developed for a final year undergraduate bioseparations module. There are a number of links to sites for modeling adsorption chromatography. For example, a link to an Excel spreadsheet provides a demonstration of varying N, l, and K (or alpha)affect band separation. Other links explain adsorption isotherms in the context of bioseparations.
This is a general interest website in electrochemistry, offering answers to many common questions. Sections include impedance spectroscopy, quartz crystal microbalance, reference electrodes, simulation voltammetry, potentiostats and handling of mercury. A list of web and book references is available, as is a \\\\\\\"contact us\\\\\\\" tab for questions to the author.
Determination of DNA Bases Chemistry: A Discovery-Based Experiment
The paper contains details of an electrochemistry lab where students are given the time to explore and design an experiment to identify the different DNA bases. The paper has a very useful compendium of literature relating to electrochemical techniques.
Flow Injection Analysis in the Undergraduate Laboratory
This paper titled, Flow Injection Analysis in the Undergraduate Laboratory, by Rocha and Nobrega was published in the Chemical Educator. It describes two basic experiments. One is the measurement of copper using PAR reagent as carrier in a single line FIA system. Increasing the reaction coil length results in double peaks. Refractive index effects are demonstrated in the two-line system by adding ethanol. The second experiment is the measurement of phosphate with the molybdenum blue reaction
Motion Mountain: The Free Physics Textbook
This site provides a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written for the curious: it is entertaining, surprising and challenging on every page. With little mathematics, starting from observations of everyday life, the text explores the most fascinating parts of mechanics, thermodynamics, special and general relativity, electrodynamics, quantum theory and modern attempts at unification. The es
Redes Inalámbricas en los Países en Desarrollo (Segunda edición en español)
The book is intended to be a comprehensive resource for technologists in the developing world, providing the information that they need to build real networks. By bringing this knowledge to the outer edges of the Internet, we hope to help jumpstart the construction of vital network infrastructure. Besides the topics included in the first edition, covering from basic radio physics and network design to equipment and troubleshooting, the second edition includes a new chapter dedicated to Voice ove
Types of Antennae
This illustrated guide is designed to help students recognize and learn the different types of antennae found on arthropods. The single Web page, which can be easily printed for use at field sites or in the lab, shows plumose (featherlike) pectinate (comblike) serrate (sawlike) moniliform (beadlike) filiform (threadlike) aristrate (with bristles) elbowed (with a bend) clubbed (the segments towards the end are larger).
Parts of an Insect (Grasshopper)
This illustrated guide to a grasshopper is designed to help students recognize and learn the body parts of an insect. The single Web page, which can be easily printed for use at field sites or in the lab, also includes a short description for the following labeled parts: head thorax antenna abdomen spiracles coxa trochanter femur tibia tarsus genitalia wings.
This illustrated guide to leaf types is designed to help students understand the differences between compound and simple leaves. This single Web page can be easily printed for use at field sites. Along with an explanation of both types, the guide includes a short description of these related terms: petiole, leaf blade, leaflet, and axillary buds.
Parts of a Spider: Dorsal View of a Male Spider
This illustrated guide (dorsal view) to a male spider is designed to help students recognize and learn its common and unique body parts. The single Web page, which can be easily printed for use at field sites or in the lab, also includes a short description for the following labeled parts: chelicera pedipalp anterior eye row posterior eye row cephalothorax (or prosoma) pedicel abdomen (or opisthosoma) spinnerets coxa trochanter femur patella tibia metatarsus tarsus.
Some Clues to Describing and Understanding Organisms
This online guide helps students focus their biodiversity research in the classroom, field, and lab. It includes general and specific questions to consider, designed to help students see the clues they might otherwise miss and give them the vocabulary to discuss their findings. General questions include "What might this clue indicate?" and "Does the organism always occur in the same 'zone'? "Plant-specific questions range from "If it's woody, is there one main trunk (trees), or are there several
This OLogy activity serves as a kid-friendly how-to manual about searching for fossils. In Not Just Any Rock Will Do, kids learn that fossils "hide out" in sedimentary rock and see examples of shale and sandstone. Do's and Don'ts for Fossil Hunters gives kids practical tips and a list of fossil-hunting supplies. In Fossils You May Find, there are photos of common invertebrate, vertebrate, and plant fossils to guide kids. Paleontology Clubs and Web Sites lists resources to help kids determine whe
Feed the Birds
This OLogy activity introduces kids to the concept of biodiversity by helping them discover the diversity of their local bird population. To begin, students create a simple bird feeder from a milk/juice carton or a plastic soda bottle. They then fill the feeder with black-oil sunflower seeds, popular with a range of birds. In addition, they are given a list of additional foods to experiment with, such as millet, raisins, and breakfast cereal. Students track the birds that visit their feeder in f
National Center for Science Education
The National Center for Science Education (NCSE) is a nonprofit organization working to defend the teaching of evolution against sectarian attack. The group is committed to defending the teaching of evolution in public schools. They hope to prevent the teaching of "scientific creationism" in classrooms. The site contains detailed descriptions of past and ongoing court cases, education outreach projects, and ongoing debate over the validity of evolution, plus numerous essays on the controversy. T
Assessing the Biological Weapons and Bioterrorism Threat
BIOSECURITY FOR A NEW ERA Lecture Series Biological weapons (BW) have been a significant national security preoccupation for nearly 15 years. The events of September 11 and the anthrax attacks that followed have magnified these concerns by orders of magnitude while shifting the context almost entirely to "bioterrorism." Over the past four years, the federal government has spent nearly $30 billion to counter the anticipated threat. Strangely, these responses took place in the absence of virtuall