In 1858, Darwin published "On the Origin of Species by Means of Natural Selection." His explanation of evolution by natural selection has become the unifying theme of biology. We have found that many students do not fully comprehend the process of evolution by natural selection. We discuss a few simple games that incorporate hands-on…

There are phenomena that seem impossible--at first glance. But some knowledge of physics can often allow us to plan and also perform the seemingly impossible without any magic. Here is a very simple experiment that can be done with a whole group of students. I learned about it from an activity in a science center, where it was posed as a magical…

Planisphere is a simple and useful tool in locating constellations of the night sky at a specific time, date and geographic location. However it does not show the planet positions because planets are not fixed on the celestial sphere. It is known that the planet orbital planes are nearly coplanar and close to the ecliptic plane. By making…

This study investigates how scientist-led educational programs, held in libraries, can make local science issues relevant to families. Given the need for an educated citizenry, it is important to explore if scientists -- as learning facilitators -- can use educational strategies to engage intergenerational groups. We view family learning from a…

The short view of inheritance is that it is about what every organism gets from its parents, one generation to the next. Young children appreciate that offspring have strong similarities with their parents. A longer perspective embraces the similarities and diversity in relatives' features; it includes the characteristics of predecessors within…

Sai Pathmanathan writes in this article that, over the years, her experience working with early-years children (ages 3-5) has taught her that learning it is not about whether the children get the answer right, but more about nurturing their curiosity, encouraging play and learning through hands-on activities, promoting motor skills, group work,…

A laboratory experiment is described in which students compare two methods for the determination of the calcium content of commercial dietary supplement tablets. In a two-week sequence, the sample tablets are first analyzed via complexometric titration with ethylenediaminetetraacetic acid and then, following ion exchange of the calcium ion present…

The definition of the kilogram, the unit of mass in the International System of Units (SI), has not changed in more than 125 years. The kilogram is still defined by the mass of a Pt-Ir cylinder conserved at the International Bureau of Weights and Measures. Science and technology have progressed to the point where it is likely the kilogram will be…

A simple, robust, and reproducible method was developed for the isolation of (-)-menthol from peppermint oil and to study the effect of different types of leaving groups, catalysts, solvents, and tertiary base on the extent of esterification of (-)-menthol to (-)-menthyl acetate. In this experiment, students compare leaving group properties of…

To provide a research-like experience to upper-division undergraduate students in a biochemistry teaching laboratory, isothermal titration calorimetry (ITC) is employed to determine the binding constants of lysozyme and its inhibitors, N-acetyl glucosamine trimer (NAG[subscript 3]) and monomer (NAG). The extremely weak binding of lysozyme/NAG is…

STEM education has become essential in the United States, and agriculture allows for a great opportunity to teach STEM education in a fun, hands-on manner. The Virginia Southern Piedmont Agriculture Research and Extension Center (SPAREC), in partnership with King Arthur Flour, has created a program that reinforces what is taught in the classroom…

This article provides information about the integration of innovative hands-on activities within a sophomore-level Fluid Mechanics course at New Mexico Tech. The course introduces students to the fundamentals of fluid mechanics with emphasis on teaching key equations and methods of analysis for solving real-world problems. Strategies and examples…

In this paper we report on an activity aimed at building an electromagnetic wave. This was part of a class on the concept of mass offered to a group of 20 pre-service Brazilian physics teachers. The activity consisted of building a plane wave using an apparatus in which it is possible to fit some rods representing electric and magnetic fields into…

A dynamic assessment tool was developed and validated using Mokken scale analysis to assess the extent to which kindergartners are able to construct unconfounded experiments, an essential part of scientific reasoning. Scientific reasoning is one of the learning processes happening within science education. A commonly used, hands-on,…

Ongoing developments in educational technologies place increasing demands on teachers who have to make decisions on a daily basis concerning how, when, and where to make use of technologies in classrooms. Building on results from the Danish project Technucation, this paper argues that there is a marked need for a teacher-specific version of the…