25 Years of Gettysburg

Amongst the Civil War community here at Gettysburg College, the movie Gettysburg is very much a part of our daily lives. Quotes are thrown back and forth in witty banter, the music is played for dramatic effect, and history professors are badgered to show clips in class. Since the movie fits so seamlessly into our experience here in Gettysburg, we often take it for granted. However, Gettysburg recently celebrated its 25th anniversary with a special showing at the Majestic Theater, with remarks from the director preceding the viewing. Although none of the Fellows attended, it got a lot of us thinking about our own experiences with the movie. Each one of us has been touched by Gettysburg in significant ways. [excerpt

25 years of internships

The Federal Reserve Bank of Boston has provided mentoring and paid internships to inner-city high school students since 1982. The most recent initiative, FinTech Scholars, prepares young people specifically for careers in financial services.Federal Reserve Bank of Boston ; Student internships

The PAH hypothesis after 25 years

The infrared spectra of many galactic and extragalactic objects are dominated by emission features at 3.3, 6.2, 7.7, 8.6 and 11.2 \mu m. The carriers of these features remained a mystery for almost a decade, hence the bands were dubbed the unidentified infrared (UIR) bands. Since the mid-80's, the UIR bands are generally attributed to the IR fluorescence of Polycyclic Aromatic Hydrocarbon molecules (PAHs) upon absorption of UV photons -- the PAH hypothesis. Here we review the progress made over the past 25 years in understanding the UIR bands and their carriers.Comment: 13 pages, 7 figures. To appear in the proceedings of IAU symposium 280 "The Molecular Universe

The ECMWF Ensemble Prediction System: Looking Back (more than) 25 Years and Projecting Forward 25 Years

This paper has been written to mark 25 years of operational medium-range ensemble forecasting. The origins of the ECMWF Ensemble Prediction System are outlined, including the development of the precursor real-time Met Office monthly ensemble forecast system. In particular, the reasons for the development of singular vectors and stochastic physics - particular features of the ECMWF Ensemble Prediction System - are discussed. The author speculates about the development and use of ensemble prediction in the next 25 years.Comment: Submitted to Special Issue of the Quarterly Journal of the Royal Meteorological Society: 25 years of ensemble predictio

Development Questions for 25 Years

development, growth, economic policy, institutions

Hadron structure after 25 years of QCD

We briefly review the status of our understanding of hadron structure based on QCD. This includes the role of symmetries, especially chiral symmetry, and the insights provided by lattice QCD. The main focus is on baryon structure and especially the nucleon, but this cannot be treated realistically without reference to spectroscopy. Our aim is to highlight recent insights and promising directions for future work.Comment: Invited talk presented at the 16th Int. Conf. on Few Body Problems (Taipei, March 6-10, 2000); 13 pages, 3 figure

Orbital angular momentum 25 years on [invited]

Twenty-five years ago Allen, Beijersbergen, Spreeuw, and Woerdman published their seminal paper establishing that light beams with helical phase-fronts carried an orbital angular momentum. Previously orbital angular momentum had been associated only with high-order atomic/molecular transitions and hence considered to be a rare occurrence. The realization that every photon in a laser beam could carry an orbital angular momentum that was in excess of the angular momentum associated with photon spin has led both to new understandings of optical effects and various applications. These applications range from optical manipulation, imaging and quantum optics, to optical communications. This brief review will examine some of the research in the field to date and consider what future directions might hold