Blue food colorings are notoriously unstable: researchers identify structural information of the hydrangea blue pigment

The Elusive Hydrangea Blue
![Cobalt-Catalyzed [2+2] Cycloadditions](https://www.chemistryviews.org/wp-content/uploads/legacy/common/images/thumbnails/source/14ddd81befa.jpg)
Cobalt-Catalyzed [2+2] Cycloadditions
Redox-active ligands for selective cycloadditions of unactivated alkenes

What Makes Teeth Tough?
Crack resistance in human tooth dentin may come from mineral nanoparticles with residual strain

Sensing Solvents
Porphyrin-anion supramolecular assemblies with a unique responsive behavior

Light Reduces a Chromium Hazard
Stopped-flow process sheds light on the photocatalytic reduction of Cr(VI)

Fibrillar Friction
Photochromic fibrillar surfaces become stiffer in the dark and stickier in the light, affecting the frictional behavior

New Tunable Phosphorus-Doped Conductor
Transparent titanium dioxide photocatalyst with tunable electronic properties

Molybdenum Disulfide Switches Under Pressure
Monolayer molybdenum disulfide changes its bandgap under pressure, switches from a photon emitter to a non-emitter

A Giant Leap in Nitrogen-Ammonia Transformation
New molybdenum catalyst for nitrogen fixation

Explosives are Stuck on Graphene
Nitroaromatic compounds show varying levels of attraction to modified graphene surfaces