Singlet Polaron Theory of Low-Energy Optical Excitations in NiPS_{3}.

We develop a theory that explains the low-energy optical excitations near 1.5 eV observed by optical experiments in NiPS_{3}. Using ab initio methods, we construct a two-band Hubbard model for two effective Ni orbitals.

Cultural aspects of time and ageing. Time is not the same in every culture and every circumstance; our views of aging also differ.

Time is not the same in every culture and every circumstance; our views of ageing also differ

Perceptions of childhood immunisations in rural Transkei--a qualitative study.

Objectives: To examine perceptions of childhood illnesses, and the role of immunisation in preventing them, among caretakers of young children in Mhlakulo, a rural community in Transkei, Eastern Cape, and to suggest reasons for the low uptake of immunisations in that area.

Design: In-depth qualitative research using semi-structured questionnaires, focus groups, and free listing.

Methods: Detailed interviews were conducted using standardised semi-structured questionnaires.

Remedy or cure? Lay beliefs about over-the-counter medicines for coughs and colds.

Background: Over 500 million is spent in the United Kingdom every year on over-the-counter medicines for coughs and colds. Evidence for their pharmacological efficacy is lacking.

Aim: To examine lay beliefs about over-the-counter medicines for coughs and colds.