A synthetic history of human land use: Humans began to leave lasting impacts on Earth's surface starting 10,000 to 8000 years ago. Through a synthetic collaboration with archaeologists around the globe, Stephens et al. compiled a comprehensive picture of the trajectory of human land use worldwide during the Holocene (see the Perspective by Roberts). Hunter-gatherers, farmers, and pastoralists transformed the face of Earth earlier and to a greater extent than has been widely appreciated, a transformation that was essentially global by 3000 years before the present. Science , this issue p. 897 ; see also p. 865

The exploratory investigation of two sites in Kenya throws new light on the transition from a ‘stone age’ to an ‘iron age’. The model of widespread cultural replacement by Bantu-speaking iron producers is questioned and instead the authors propose a long interaction with regional variations. In matters of lithics, ceramics, hunting, gathering, husbandry and cooking, East African people created local and eclectic packages of change between 1500BC and AD500.

Sites connected to the Second World War (WWII) are increasingly recognized as worthy of archaeological investigation. Researchers are also becoming aware that that the collectors market in objects connected to WWII, particularly those connected to Germany, is encouraging the stripping of conflict landscapes in the search for “collectors items.” Finnish Lapland is sometimes regarded as peripheral compared to more centrally located regions of Europe. Archaeologists working here nonetheless find themselves in direct competition with enthusiastic treasure hunters. This is complicated even further by the myriad ontologies employed by different individuals in the construction of their relationship with the material culture connected to recent conflict periods, and on specific “other” or “exotic” landscapes, such as Lapland. This paper examines what might be learnt about the nature of treasure hunting for and trading in WWII material from Lapland, and its position within the emerging research on broader trends in “dark” approaches to and encounters with heritage.

Following a recent worldwide boom in the democratization of knowledge, crowdsourcing and Participatory GIS, heritage practice increasingly draws on crowdsourced geographical data. In this paper, I discuss a public crowdsourcing of twentieth century conflict heritage in Finland, launched by state-owned broadcasting company Yleisradio. Here emphasis is on analysing the user behaviour and incentives, which can inform analogous future initiatives. Many of the public entries mirror local perspectives on conflict heritage: pride of personally important loci and self-satisfaction appear to be important incentives for taking part. Finally, I summarize themes that other heritage crowdsourcing organizers could apply to their work.