Social media content has grown exponentially in the recent years and the role of social media has evolved from just narrating life events to actually shaping them. In this paper we explore how many resources shared in social media are still available on the live web or in public web archives. By analyzing six different event-centric datasets of resources shared in social media in the period fro...

1492 Journal of Chemical Education • Vol. 77 No. 11 November 2000 • JChemEd.chem.wisc.edu The purpose of this article is to comment on the pedagogical ramifications of the recently claimed observation of d orbitals and the way in which these results were first announced and subsequently reported (1–6 ). Atomic orbitals—their use in writing electronic configurations and as a means of rationalizi...

Over the last few years, several close orbiting (∼ 0.05 AU) large mass planets (M ∼ M Jupiter) of nearby stars have been discovered. Their existence has been inferred from tiny doppler shifts in the light from the star. We suggest that these planets may be made of mirror matter. We also suggest that some stars such as our sun may also have a similar amount of mirror matter, which has escaped de...

A natural way to represent a 1-D probability distribution is to store its cumulative distribution function (cdf) F (x) = Prob(X ≤ x). When several random variables X1, . . . , Xn are independent, the corresponding cdfs F1(x1), . . . , Fn(xn) provide a complete description of their joint distribution. In practice, there is usually some dependence between the variables, so, in addition to the mar...

OBJECTIVE To estimate how many deaths from cancer have been avoided in England and Wales because of recent improvements in survival. DESIGN Analysis of national statistics. SETTING England and Wales. SUBJECTS 1.5 million adults with diagnosis of one of 47 different cancers during 1981-5 or 1986-90. MAIN OUTCOME MEASURES Reduction in number of cancer deaths within five years of diagnosis...

Hundreds of articles in statistical journals have pointed out that standard analysis of variance, Pearson productmoment correlations, and least squares regression can be highly misleading and can have relatively low power even under very small departures from normality. In practical terms, psychology journals are littered with nonsignificant results that would have been significant if a more mo...

Observations by the MACHO collaboration suggest that a significant proportion of the galactic halo dark matter is in the form of compact objects with typical masses M ∼ 0.5M ⊙. One of the current mysteries is the nature and origin of these objects. We suggest that these objects are stars composed of mirror matter. This interpretation provides a plausible explanation for the inferred masses and ...

Recently there is a suggestion about the star RXJ1856.5−3754, being a possible candidate for quark star. While from the estimates of the radiation radius, given by the authors, it does not seem to fit with any of the known models for such stars, the mass radius diagram admits the possibility of this being a quark star of mass M ⊙ < M < 1.4M ⊙ , provided the radius mentioned is the actual radius...

Slow-moving (v ∼ 15 km/s) ‘dark matter particles’ have allegedly been discovered in a recent experiment. We explore the possibility that these slow moving dark matter particles are small mirror matter dust particles originating from our solar system. Ways of further testing our hypothesis, including the possibility of observing these dust particles in cryogenic detectors such as NAUTILUS, are a...