Bacteria use a form of "social media" communication called quorum sensing to monitor how many of their fellow species are in the neighborhood, allowing them to detect changes in density and respond with changes in collective behavior. Because of the importance of quorum sensing to the behavior of disease-causing bacteria like Vibrio cholerae, the cause of the deadly disease cholera, understanding how it works has the potential to allow us to disrupt it for therapeutic purposes.

Passed in 2016 in the United Kingdom and due to come into force on 26 May, the Psychoactive Substances Act bans all new psychoactive substances (NPS) except those specifically exempted, such as alcohol and tobacco. The Act has attracted much criticism from scientists and experts. But what better alternative exists? The scientific journal Addiction has today [25 May] published the opening statement in a debate by leading addiction researchers from around the globe.

The opening statement, by Prof Peter Reuter and Bryce Pardo of the School of Public Policy, University of Maryland, outlines three problems with the Psychoactive Substances Act's total ban of NPS:

Brivaracetam (trade name: Briviact) has been approved since January 2016 as add-on therapy for adolescents from the age of 16 years and adults with epileptic seizures. The German Institute for Quality and Efficiency in Health Care (IQWiG) now examined in an early benefit assessment whether this drug offers an added benefit for patients in comparison with the appropriate comparator therapy.

The drug manufacturer presented no data from a study of direct comparison, and the indirect comparisons conducted in its dossier were unsuitable for the derivation of an added benefit for several reasons. IQWiG therefore sees no hint of an added benefit of brivaracetam in comparison with the appropriate comparator therapy.

Vismodegib (trade name: Erivedge) has already been approved since 2013 for the treatment of patients with locally advanced basal cell carcinoma (BCC) or symptomatic metastatic BCC and has already undergone an early benefit assessment according to the Act on the Reform of the Market for Medicinal Products (AMNOG). The Federal Joint Committee (G-BA) limited its decision in February 2014 to two years, which is why the drug manufacturer now submitted a new dossier.

Babies find it easier to learn words with repetitive syllables rather than mixed sounds, a study suggests.

Assessments of language learning in 18-month-olds suggest that children are better at grasping the names of objects with repeated syllables, over words with non-identical syllables.

Researchers say the study may help explain why some words or phrases, such as 'train' and 'good night', have given rise to versions with repeated syllables, such as choo-choo and night-night.

The researchers say such words are easier for infants to learn, and may provide them with a starter point for vocabulary learning.

An assessment of genomic diversity in the United States of America clarifies the role of pre-Civil War admixture and early 20th century transit routes in shaping the migration history and genomic diversity among African-Americans communities. The new study, by Simon Gravel of McGill University and colleagues, will publish on May 27, 2016 in PLOS Genetics.