The concrete jungle, with skyscrapers standing hundreds of meters tall, can be quite effective in accommodating urban residents and office workers, but when humanity strays aloof from nature for too long, we tend to feel stressed even unconsciously. Pocket parks offer a good solution to over-developed downtown areas where land is both precious and costly. / Malatang craze: Humble street food of Tianshui takes China by storm (20:38). On the show: Laiming, Niu Honglin & Guo Yan