We thank our colleagues for their insightful comments. The weight of modern evidence is against the notion that contemporary human cultures can be tracked backwards into the Pleistocene (e.g. Lee & DeVore 1976; Kuper 1988; Wilmsen 1989; Solway & Lee 1990; MacEachern 2000). Modern-day hunter-gatherers are not our Stone Age ancestors. Current protestations notwithstanding, the provocative title that d'Errico and colleagues (2012) chose for their paper, ‘Early evidence of San material culture represented by organic artifacts from Border Cave, South Africa’, unambiguously asserts the opposite. Our critique of that paper's content does not question the robusticity of the methods employed at Border Cave (for this, see Evans 2012). Rather, our comments focus on the theoretically flawed search for a specifically ‘San’ “cultural adaptation” (d'Errico et al. 2012: 13214) at any Pleistocene archaeological site.

Analogies are an important tool of archaeological reasoning. The Kalahari San are frequently depicted in introductory texts as archetypal, mobile hunter-gatherers, and they have influenced approaches to archaeological, genetic and linguistic research. But is this analogy fundamentally flawed? Recent arguments have linked the San populations of southern Africa with the late Pleistocene Later Stone Age (c. 44 kya) at Border Cave, South Africa. The authors argue that these and other claims for the Pleistocene antiquity of modern-day cultures arise from a fundamental misunderstanding of the nature of cultural and archaeological taxonomies, and that they are a misuse of analogical reasoning.

Significant new opportunities for astrophysics and cosmology have been identified at low radio frequencies. The Murchison Widefield Array is the first telescope in the southern hemisphere designed specifically to explore the low-frequency astronomical sky between 80 and 300 MHz with arcminute angular resolution and high survey efficiency. The telescope will enable new advances along four key science themes, including searching for redshifted 21-cm emission from the EoR in the early Universe; Galactic and extragalactic all-sky southern hemisphere surveys; time-domain astrophysics; and solar, heliospheric, and ionospheric science and space weather. The Murchison Widefield Array is located in Western Australia at the site of the planned Square Kilometre Array (SKA) low-band telescope and is the only low-frequency SKA precursor facility. In this paper, we review the performance properties of the Murchison Widefield Array and describe its primary scientific objectives.