Describes some unique features of marsupial reproduction which include (1) chromosomal sex determination, (2) reproductive system, (3) birth, (4) location, and (5) embryonic diapause. These features suggest that viviparity evolved separately in eutherian and marsupial stocks after their derivation from a common oviparous ancestor. Bibliography.…

Discusses the theory of the Josephson Effect, the derivation of the Josephson voltage-frequency relation, and methods of measuring the fundamental constatn ratio e/h. Various types of Josephson junctions are described. The impact of the measurement of e/h upin the fundamental constants and quantum electro-dynamics is briefly discussed.…

Surveys the responses given to a physics problem regarding calculations of the temperature difference between the internal and external surfaces of a pan with boiling water. Presents a numerical answer to the problem. (DS)

Presents a general review of current practical applications of the properties of superconducters. The devices are classified into groups according to the property that is of primary importance. The article is inteded as a first introduction for students and professionals. (Author/DS)

American Chemical Society Panel on International Aspects of Chemical Education recommends: (a) science educators should participate in re-examination of their nation's development goals, (b) science education should be extended in all countries, (c) chemical education should be continually renewed in each country. (DS)