Water is essential for plant growth and development, and the degree of its availability significantly shapes ecosystems in different climate zones. How does an overabundance or deficiency of water affect the flora in Poland and different parts of the world?

Prof. Przemysław Śleszyński from the PAS Institute of Geography and Spatial Organization in Warsaw (author of an extensive study of 122 medium-sized Polish cities) explains why Poland’s midsize cities are facing depopulation.

Antarctica is a land of surprises. How low are the lowest temperatures ever recorded there? Is there life at –50°C? Is there anywhere on the continent tourists can actually enjoy swimming?

We talk to Roman Topór-Mądry, MD, chairman of the PAS Committee on Public health, and Tomasz Zdrojewski, MD, from the Jagiellonian University’s Public Health Institute, coauthors of the first Report on Diabetes in Poland, about counting the number of diabetics and data-gathering techniques.

No one could have expected that on the first day that LIGO detectors were running, scientists would register signals of gravitational waves. We discuss the watershed discovery confirming the general theory of relativity with Dr. Andrzej Królak from the PAS Institute of Mathematics and Dr. Michał Bejger from the PAS Nicolaus Copernicus Astronomical Centre, both members of the Virgo-POLGRAW group.

The right to freedom and the ethics of preventive vaccinations.

Prof. Wojciech Burszta from the PAS Institute of Slavic Studies discusses what has remained of the ideals of the cultural revolution that took place in the 1960s.

Astronomers who work during daylight hours focus on observing sunspots. Why are they keeping a close eye on them right now in particular?

What is smog, what does it consist of, and where does it come from? How badly polluted is the air in Poland in relation to other countries in Europe?

Prof. Mirosław Wielgoś, MD, Rector at the Medical University of Warsaw, talks about why women of all ages should undergo prenatal testing and where they can turn for help.

We talk to Dr. Ewa Duszczyk from the Polish Society of Epidemiology and Infectious Diseases about diseases lurking just out of sight and about how vaccines save lives and protect communities.

Woda jest niezbędna do wzrostu i rozwoju roślin. Jej ilość decyduje o tym, jak wyglądają ekosystemy poszczególnych stref klimatycznych. Jak niedobór i nadmiar wody wpływają na szatę roślinną różnych obszarów świata i Polski?

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics.

Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points.

Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics.

Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points.

Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.

Główną atrakcją dla astronomów w ciągu dnia jest obserwacja plam słonecznych. Dlaczego akurat teraz wypatrują ich szczególnie uważnie?

O tym, dlaczego polskie miejscowości się wyludniają, mówi prof. Przemysław Śleszyński z Instytutu Geografii i Przestrzennego Zagospodarowania PAN w Warszawie, autor „Analizy 122 średnich miast tracących funkcje społeczno-gospodarcze”.

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics.

Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points.

Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.

Czym jest smog i z czego się składa? Jak powstaje? Jak zadymiona jest Polska w stosunku do innych krajów Europy?

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics.

Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points.

Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.