Top 100 presentations

1. Continuous Verb Tenses
   35506
2. Support and transport in plants
   33968
3. Anyong Tubig Anyong Lupa sa Asya
   29533
4. Elements compounds and mixtures
   26137
5. Chromosome
   22262
6. Simple Verb Tenses
   20863
7. Atomic Structure
   20398
8. Balancing Chemical Equations. Balancing redox equations
   20267
9. Periodic Behavior
   19975
10. Newton’s laws of motion
    19003
11. Periodic Trends
    16797
12. Adverbs
    16676
13. Percent Composition, Empirical and Molecular Formulas
    16041
14. Animal Farm
    15882
15. Bonding, Molecular Shape & Structure
    14845
16. Circulation and Gas Exchange
    13596
17. MakingFood
    13499
18. DNA - An overview
    13231
19. Atomic Structure and Periodic Trends
    13032
20. Fungi
    12955
21. Volumetric
    12764
22. Atomic Structure and Periodicity
    12596
23. Feminism- Cure or Curse
    12593
24. Hormones and the Endocrine System
    12328
25. Animal Development
    12251
26. Derivation Applications of Bernoulli Principal
    11966
27. Osmoregulation and Excretion
    11612
28. Plant Structure, Growth, and Development
    10868
29. Plasma Membrane-Gateway to the Cell
    10865
30. Acid, bases and salts
    10413
31. Development
    10313
32. Mirrors and Lenses
    10252
33. Structure of the Atom
    9999
34. Balanced forces
    9982
35. Ancient Civilizations
    9885
36. Mass Spectrometry
    9805
37. Pronouns
    9782
38. Resource Acquisition and Transport in Vascular Plants
    9779
39. Nouns
    9749
40. Support and transport in plants
    9441
41. Forests
    9432
42. Atomic Structure
    9376
43. Newton’s third law of motion
    9030
44. Cell Types and Cell Structure
    9020
45. Animal Nutrition
    8833
46. Transplantation Immunology
    8700
47. Cellular respiration
    8553
48. Sensory and Motor Mechanisms
    8476
49. Growing Plants
    8448
50. Plant Responses to Internal and External Signals
    8344
51. Electrical Circuits
    8304
52. Lab Equipment
    8102
53. Prepositions
    8017
54. Neurons, Synapses, and Signaling
    8013
55. Viruses, Viroids, and Prions
    7949
56. Of Mice and Men
    7893
57. A Tour of the Cell
    7876
58. Basic Structure of a Cell
    7715
59. Real time PCR and it's functions in diagnosis
    7680
60. Covalent Bonding (Molecules)
    7628
61. Plant structure adaptations and responses
    7581
62. Cellular Division
    7509
63. Ionic Bonding
    7486
64. Mendelian Genetics
    7166
65. To Kill a Mockingbird
    7132
66. Sound
    7105
67. Satellite Orbits and Uses NIS
    7099
68. Blood Type Genetics
    7068
69. Well logging The Bore Hole
    6971
70. The Immune System
    6956
71. Molecules and Ions
    6954
72. Membrane Structure and Function
    6882
73. Animal Reproduction
    6825
74. The Chemistry of Acids and Bases
    6799
75. Angiosperm Reproduction and Biotechnology
    6767
76. Mendel and the Gene Idea
    6698
77. Plant Diversity
    6694
78. Cell Communication
    6657
79. Rocks
    6647
80. Balancing Chemical Equations
    6548
81. Rate Laws
    6410
82. Introduction to Oscillations and Simple Harmonic Motion
    6390
83. Drama
    6374
84. Hybridization of Orbitals
    6354
85. The Building Blocks of Matter Atoms
    6322
86. An Introduction to Metabolism
    6262
87. Empirical Formula
    6244
88. Electron Quantum Numbers
    6217
89. Translation. Protein from RNA
    6111
90. Neurons
    6092
91. The Structure and Function of Large Biological Molecules
    6084
92. Photosynthesis
    6026
93. The Mole
    5936
94. Cell Membrane + Tissues & Organs Definitions
    5926
95. Earthquakes
    5880
96. Karyotypes
    5860
97. ADP, ATP and Cellular Respiration
    5837
98. Endocrine System
    5769
99. Classical greek philosophy
    5761
100. Population Ecology
     5755

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)