Freiberg's Disease Involving First Metatarsal Bone Bilaterally in an African Male Patient: A Case Report.

Freiberg's disease is a rare disorder affecting the distal metatarsal bones. With no quantitative estimate of its prevalence, the exact pathophysiology of Freiberg's disease is not clearly recognized. However, micro-trauma, repetitive injury, and vascular insufficiency have been implicated the most as predisposing factors for the condition.

An all-Africa dataset of energy model "supply regions" for solar photovoltaic and wind power.

With solar and wind power generation reaching unprecedented growth rates globally, much research effort has recently gone into a comprehensive mapping of the worldwide potential of these variable renewable electricity (VRE) sources. From a perspective of energy systems analysis, the locations with the strongest resources may not necessarily be the best candidates for investment in new power plants, since the distance from existing grid and road infrastructures and the temporal variability of power generation also matter. To inform energy planning and policymaking, cost-optimisation models for energy systems must be fed with adequate data on potential sites for VRE plants, including costs reflective of resource strength, grid expansion needs and full hourly generation profiles.